Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf0f95a150052773…

MALICIOUS

PDF

79.6 KB Created: 2021-09-16 23:33:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a1ae80c11f95976cc3c0d9775667b912 SHA-1: 53646cff980bf1f1cdd9ef3ee7cdc34382d37e19 SHA-256: bf0f95a15005277304807111b6df7e6d0c267530bdeebf6091dd2b3646395ab4
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate a link farm designed to redirect users, and ClamAV detection confirms a phishing/trojan classification. The malformed stream length suggests an attempt to hide malicious content or exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://pistant.ru/uplcv?utm_term=epiphany+in+a+sentence PDF link annotation
    • https://kiptep.ru/file/66138105154.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210904_005114.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/7qrdmm057paklf7gh0296j4se1/56150888923.pdfIn PDF document text
    • http://irinabailey.com/upload/files/27192061977.pdfIn PDF document text
    • http://3mfa.com/images/editor/files/8283509179.pdfIn PDF document text
    • https://rainbowprinter.com/app/webroot/files/file/68023931981.pdfIn PDF document text
    • http://mikailang.com/userfiles/file/20210916052329_1678851312.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/63204965558.pdfIn PDF document text
    • http://stringladies.cz/userfiles/269060862.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/ccd4abe89de0d0fc3b5033cc80a0ab98/zoxegi.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/bakofoxeganexiligodun.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/47596911647.pdfIn PDF document text
    • http://dreamscar.eu/userfiles/file/46597317266.pdfIn PDF document text
    • https://playworkspartnership.ca/sites/default/files/file/31006357728.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/likugepedugupulol.pdfIn PDF document text
    • http://kxzyjy.com/CKEdit/upload/files/wigonobuleboduxekikisizem.pdfIn PDF document text
    • http://e-motyle.natura2000.pl/imgturysta/files/bifoxo.pdfIn PDF document text
    • http://spostojow.pl/userfiles/file/58449851725.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/purepojadovejawegepag.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/87834454184.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143a5d3a361b---lovakitotokovivukeno.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/lijuxawuzalatobuko.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/fewatit.pdfIn PDF document text
    • https://zd-zeta.com/uploads/files/202109071331576965.pdfIn PDF document text
    • 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_off0000d4e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFA 17368 bytes
SHA-256: 094fc231f0aa4733453f811889a99ab726d6c9f528f65238437c0f4e07174a67
font_02_sfnt_off000119df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119DF 10300 bytes
SHA-256: 9f9a2dca096a9761d564fcae341b1cadd5c84de856c45fd9f3fb13d3f620b112

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