Malicious PDF — malware analysis report

Static analysis result for SHA-256 a99205f759ab0714…

MALICIOUS

PDF

83.9 KB Created: 2021-07-06 05:47:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8ceb66c0738ca6ae882b1d3873e6eef9 SHA-1: c9fa88f80ba675e90cfc2c825aacb65901ac2f70 SHA-256: a99205f759ab0714ac937b1a7d5082f37535c958d157f9439dd2137b2e675741
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The 'SE_CALLBACK_LURE' heuristic indicates a potential callback phishing or tech-support scam pattern, although the specific lure text is not available in the extracted document body.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa85f897562---vemitupikepexitufali.pdf
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/fec24cdde45d5b616e587b60576f6449/86225414661.pdf
    • https://searchlink.org/userfiles//file/14705298005.pdf
    • http://kimbuunguyen.com/uploads/userfiles/file/5938152458.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/g8fl19ckjjgoqs73f1n8b87ekd/mofumavozap.pdf
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/20216211116344575.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf37bd1438---90599262103.pdf
    • http://amphorabeautyclub.com/campannas/file/zafuxubeje.pdf
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/2i8ehk3eiep8du2fl8t18k14q3/64022251440.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e3926ada115---valuwenojitasofofep.pdf
    • https://anpheatingandac.com/nbloom/fckuploads/file/sikuwalazuxajazi.pdf
    • http://skogsformedling.se/bilder_umeny/File/91023371943.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aabad5774e9---jewasoto.pdf
    • https://gaziemirkentkonseyi.com/upload/files/sofanatibora.pdf
    • http://aggengr.com/uploads/CMS/file/1280451829.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16091cf6371925---dewedobi.pdf
    • http://talk200.com/admin/admin/uploadfiles/file/97689741350.pdf
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/c474fd9d7d8aa25a651fec214b319f18/wuretanoruruvivotu.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095f8250232b---40259168872.pdf
    • https://xo-sound.ru/userfiles/file/44139190434.pdf
    • http://monroehighbeachreunion.com/clients/8/88/88bd109b8fc96949fe6caf7698e88fda/File/lejibekewati.pdf
    • https://lemanssrl.it/file/saxetunag.pdf
    • http://splogservice.ru/content/files/ginejuxekomude.pdf
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/4fd34372acc9da3c5b88041055abfbf7/mafudenojujenolidelodoxu.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b40414e297---pejetilemawevupo.pdf
    • http://ekonopuntos.com/campannas/file/25719062938.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=transfer+of+property+after+death+with+will
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e600.bin
405c5904b5647e1c0ac13b6836f0765dd1586c5f6d025be5fafa494e1c2b2bad
pdf-font-stream PDF embedded font (sfnt) at offset 0xE600 10760 bytes
font_01_sfnt_off0000fec1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC1 16792 bytes
font_02_sfnt_off000116d3.bin
0ec92d53dad1ec217e232c6ff0a53fa4138026aea46bc8ad223056141f398ed9
pdf-font-stream PDF embedded font (sfnt) at offset 0x116D3 16240 bytes