Malicious PDF — malware analysis report

Static analysis result for SHA-256 a40c193a05a98476…

MALICIOUS

PDF

101.6 KB Created: 2021-08-01 02:51:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 6e2a00cdaa5252a65778f311139bd398 SHA-1: 4b4ec40c4707540c2b1bc665d688265b0a57224f SHA-256: a40c193a05a984765a6e42787f75792474a0e547b39bfd15f0a7b9beb6cde0b5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely serves as a phishing lure or a distribution point for malware. The document contains a link farm pointing to numerous external URLs, many hosted on compromised CMS platforms, suggesting an attempt to redirect users to malicious sites. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports the conclusion that this file is designed to facilitate malicious redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://autotrans911.com/thread/admin/uploads/file/kodewataruvizepuwe.pdf In PDF document text
    • http://ilovechardonnayhills.com/userimages/83703070324.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/2qcl86uam3bpcp1eg8tt9fdpla/tuzowu.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/24997965234.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/puvitojuwewemunizosulu.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/00829bba68e7329d0ae571703abc9f1d/34743920447.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070fdcb802d0---14930682146.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/a9rm7nmm1lkt8rv59ugj2vvdrn/47821203458.pdfIn PDF document text
    • http://stagnesreunion.com/clients/e/ed/ed16748122b3ff8ec97113314e0446c4/File/wawopusekesuxoxemetikajiw.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210626082331.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/903f99797bb1bd092669bf846f1ff0f9/53341834423.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/3ed38fae941b2e0dccf8370e75caa3be/30723380310.pdfIn PDF document text
    • http://lhsclassof1971.com/clients/74120/File/47953294063.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad3cdb4889---42063263032.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/9eq5rojrpo53st00skf47mj6dd/69752915542.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/e8a70a7aa62794b8ee34045ea7ff94c1/27591186813.pdfIn PDF document text
    • https://itacademyindia.com/ckfinder/userfiles/files/zokejoxogibogawunawu.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/7226657484.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610316a7e3be9---dafinozep.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/wisesuv.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c03fa47dd1---resed.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/mobavoxulapenum.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/naworebalugikabejefoni.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/dd4d57073dbc22aacf24daf9b9ba0126/xukijometavipibefito.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/156f06b09c69eef132e7aa40a08585b5/jezedoderorasew.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082a96ecaf6c---60368248122.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=o+level+chemistry+notes+uganda+pdf+downloadPDF 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_off000124fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124FA 18084 bytes
SHA-256: 3db3729f8bdfffcc243ef0a08e548227596800e6afb43a087e5a583a0d936a6e
font_01_sfnt_off0001549b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1549B 11456 bytes
SHA-256: 28ac0bf33bbc8b76d3dfb653a8f7cd9b3548baf024501d8a706502497d4be25a
font_02_sfnt_off00016f6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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