Malicious PDF — malware analysis report

Static analysis result for SHA-256 b62c49ca09801cd2…

MALICIOUS

PDF

99.6 KB Created: 2021-08-03 07:43:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0653d51dfaf2752d86508522abc7fe7a SHA-1: b81eeb9f4ec313ab6a2e5a01684e06fc22c28376 SHA-256: b62c49ca09801cd22e3aeb0b120343c6a310950a80841891563e69ec9009e042
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be redirecting users to potentially harmful external sites, likely as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://monkey-do.net/userfiles/file/tebazimudutakeluk.pdf In PDF document text
    • https://la-klamm.org/userfiles/file/susujevekodomuramabudig.pdfIn PDF document text
    • http://ruihuitax.com/files/file/28168109668.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/b8eb03ae3eeb016dbeec1a88f95984c1/fopavipezerujoroxup.pdfIn PDF document text
    • http://dhs1970.com/clients/9/98/98bceae81adeaace0f0761aa7b0d12fa/File/22474794249.pdfIn PDF document text
    • http://bscartridge.com/pic/petagegefub.pdfIn PDF document text
    • http://disonde.com/filespath/files/20210802231306.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b79884a015---gatemumebowe.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/lutuwa.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/zevejofutasojizonesiboxa.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/mijatukugep.pdfIn PDF document text
    • http://hoangminhphatkorea.com/webroot/img/files/kevofiligaxatud.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/a620hac144pvgekfcmecb5o4ve/81906771817.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/94463877425.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/mazorajukibolewozed.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/4cutfq0ah7qvepvoq547d319aa/mejasupalizovezabojelib.pdfIn PDF document text
    • http://apex-architect.ru/images/file/giwetujavupoza.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/76088418026.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/160e9c4947beeac5d5b5adb8334b6f16/kejodisi.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/bcfe020e0fe8248aefeffecc18edb88f/16467472495.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/2812443673.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/923ded6f7013a0ded8b37fcf0501bd4c/luzuwugifijenokoruju.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/dc9054fcccb5d2b5c7645777bc58e214/jowajanaw.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/xufizatamefovopuxitutaxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=masa+molar+del+fenolPDF 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_off00011ada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ADA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000132f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132F1 10316 bytes
SHA-256: 0445c78c0833e8ddbde84588b818eb82b87f06a1d22351a07b2e702d0dde045c
font_02_sfnt_off00014a25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A25 20352 bytes
SHA-256: 3c830e9f82105b315cd7d9f25d92cbfb5e3ec10ac23b4caa2078164080d92f86

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