Malicious PDF — malware analysis report

Static analysis result for SHA-256 b77e3eff5f1b8257…

MALICIOUS

PDF

83.0 KB Created: 2021-09-04 09:35:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 351bc8b7d5fc71afb1a86ceb12b5b83d SHA-1: b734b7bd71a94395773a75156a673ed2f77e96f6 SHA-256: b77e3eff5f1b82579a3de2fd216e7445595a6951e312a7a2dfd093efc4175cce
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://patronusalapitvany.hu/public_html/upload/33647873767.pdf In PDF document text
    • http://allaboutdowney.com/userimages/zonazaxariletizirebadef.pdfIn PDF document text
    • http://mtjjt.com/2013/upload/article/files/210723123212406089ys2oi.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e633150550---durulijujujufononaganariz.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/70147278089.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/mtq21g4i899h5ukuo34i9mrdu7/79677471632.pdfIn PDF document text
    • http://bakoca.hu/files/file/durununokesubebumib.pdfIn PDF document text
    • https://lecormier-menuiserie.com/www/upload/files/bupaluzevewavinetukoraxo.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/petosit.pdfIn PDF document text
    • https://rcot.org/userfiles/file/bedenivar.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160853052b7cb9---81500188804.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/josiva.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160753bda152f6---18584717752.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d2bb36ef8---benuvotaxiwejadused.pdfIn PDF document text
    • https://topjobsnepal.com/ckfinder/userfiles/files/jogafuveboxe.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/34198705612.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a81d2c9118c---93052778338.pdfIn PDF document text
    • http://khachsansapa.vn/webroot/img/files/mapafifekele.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/31562792859.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/93ea7dc1139768022842c27c96d29db2/94852902617.pdfIn PDF document text
    • https://clubon.top/uploads/files/8918131344.pdfIn PDF document text
    • http://dhs1970.com/clients/9/98/98bceae81adeaace0f0761aa7b0d12fa/File/17431124518.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/68717767198.pdfIn PDF document text
    • https://equimat-cheval.fr/file/34753908088.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/72844395583.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/29a2b5bb597c04e7f5cf666f54f5ea52/dawotofusonowomunu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=inflammatory+back+pain+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_off0000e1c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C0 17076 bytes
SHA-256: b9f8266c7e255e1e29f3bb875ee2b409bc0927f0b522f6fe788758b0e82ee1d1
font_01_sfnt_off00010db3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB3 10780 bytes
SHA-256: a48778b6d35d884e4046a977539c03b5a77a6cd987b847d5a402e8e2353f15c6
font_02_sfnt_off0001264a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1264A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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