Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6edc7140485f9ce…

MALICIOUS

PDF

86.9 KB Created: 2021-07-20 15:44:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2fc25d59e8c45f101897ca128db6fe0c SHA-1: 72c48e0731177e5a27e0f0d9590512a92cf07a3d SHA-256: a6edc7140485f9ce522057cfa18d0ba312788f6b63fa2f3471c92a2ec2535fe8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution T1553.005 Mark-of-the-Web Bypass

The PDF file was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it is a link farm hosted on compromised CMS uploads. Crucially, the document contains instructions to disable security software, a strong indicator of malicious intent to bypass defenses and likely download further payloads. While no scripts were directly extracted, the overall structure and heuristics suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/91ae3d99a63025afbb3aeeebef76f307/mukawifen.pdf In PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e814bba794---tavidanusifakug.pdfIn PDF document text
    • https://argumentua.com/i/file/jaxuvejepibigegilok.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094ae57387db---25259813935.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/b549c66e3b567351104dfabf088bc0a8/tuvoviwunatesewogulelu.pdfIn PDF document text
    • http://draftingfloorplan.com/ckfinder/userfiles/files/lusawiboxagadirevuki.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1ebc6c3b22410c2c542096e0a70e1171/wakubaniwipefazovuponuguw.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16078079586464---75534327568.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/46645277847.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ae35e29ed---zanelo.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/risizafovubufejob.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c385e9b8734---80270479857.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210627080623.pdfIn PDF document text
    • https://tch.lu/files/files/muveluvokabi.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/98073202817.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160da5a7234933---tanumimeroliwapuximozus.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/94351782508.pdfIn PDF document text
    • https://raljob.com/userfiles/file/mopopikisikuxadogojopapin.pdfIn PDF document text
    • https://dp-engineers.com/admin/userfiles/file/laselufozibutizulonotos.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7faacb1574---68223292810.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607efde4c723e---wixajexepijolonidabew.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gavul.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/cd81554f72e30abf3f1125a72f823d34/31026963178.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/juuv9h7obbm915o591u3ba59ka/jafezoxekavomiridopaki.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa963820a4---17899086057.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/34606bf782d0e47d51c1c420f39acf1a/18800383605.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=this+app+been+blocked+for+your+protectionPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA7 17072 bytes
SHA-256: b206647f2b346ca20df58ee1dc97994f2a18241f51618e3509ffd6e33c35d463
font_01_sfnt_off00011c61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C61 11124 bytes
SHA-256: e949eefbfaf2b837b278a2c844c69fb44b3ed34b2fd803aeb2bccbe9fbc11338
font_02_sfnt_off0001361f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1361F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.