Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7dd53652d6d0db2…

MALICIOUS

PDF

89.1 KB Created: 2021-08-03 02:52:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e6da8c750ec5765c2652d314d617a941 SHA-1: f4b76a9f5074a4b68034eafd4277295965efc9f8 SHA-256: e7dd53652d6d0db2023ea6207cc7e91e100c1cca3345a36b0a8bce84586f2fb5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan-like behavior. It contains numerous links pointing to potentially compromised websites, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and link farm heuristics strongly suggests the document's primary purpose is to facilitate access to external malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbb9a4e613---rimikodejavowubujifix.pdf In PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f420c1d214---jexasafimunekirorotanuzad.pdfIn PDF document text
    • http://naphotelbangkok.com/userfiles/files/12272585869.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/87527259649.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2s5g90vj1nmkr4mtd6vlaerto4/gobifedaviboli.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/52732011770.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/ef68cade02c3bc051173659af8746e0e/tiwop.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d536b7fded---87395978479.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/96445433604.pdfIn PDF document text
    • https://fratellifurloni.it/file/zifuveker.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/27296823695.pdfIn PDF document text
    • http://ntep2008.com/UserFiles/File/raboxometogelelete.pdfIn PDF document text
    • http://hcviet.com/img-phuctri/files/dewefijolanaw.pdfIn PDF document text
    • http://nkmate.com/FileData/ckfinder/files/20210704_37D06DD87EE263B5.pdfIn PDF document text
    • http://www.tekkoo.net/images/library/File/15867933220.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/c6d9fc4a33d07946a9323ef02cffd174/67093459803.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/46508475053.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/95311560793.pdfIn PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/45044465670.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/7610376005.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722d3d1ff10---13821755334.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160754e1327820---98314878014.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16080b5c66aacd---53487329530.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/bimuvu.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/nigikududexevo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=ielts+listening+practice+test+2021+with+answers+pdfPDF 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_off0000f804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF804 11108 bytes
SHA-256: 7c5d665c17a371aa1fbfad4ffa85fa50dc26dda6afcd15bccca517f97fd1fc7d
font_01_sfnt_off000111d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E7 17324 bytes
SHA-256: f416c8f9e2f731a9184be0656a768d036894bbb131855f724ac773b95f5edb79

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