Malicious PDF — malware analysis report

Static analysis result for SHA-256 85d5cb3bc23b3ea4…

MALICIOUS

PDF

82.8 KB Created: 2021-07-30 07:06:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 232d4ae61407e363b5c5c99f9ad12755 SHA-1: d71d6ca1393a671c2449cceaf0d6e0fc5ca49c12 SHA-256: 85d5cb3bc23b3ea445cee8c85edc3d7d6038309be89223fe6bdd300be8162c63
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a callback phishing lure. It contains numerous links to PDF files hosted on various domains, suggesting a link farm designed to distribute malicious content or redirect users. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/m182b2vp3ko7slkk3u9vj341tl/geluwofaziwozezalipezex.pdf In PDF document text
    • http://hanifeugur.com/image/files/36105140906.pdfIn PDF document text
    • http://premium-h.info/files/files/12937206993.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/51378282392.pdfIn PDF document text
    • https://master-service.ro/images/file/konazuja.pdfIn PDF document text
    • http://palami.by/images/file/faluwajolapa.pdfIn PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/tozudevutaduzotada.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/lipedorigino.pdfIn PDF document text
    • https://digbijoynath.in/iisc/ckfinder/uploads/userfiles/files/midoxoz.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/10389831065.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/siviboxizakojuson.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/19060327584.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/61d3811f41e0585d5c40d648421439b8/35034256214.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fd8655baa---48395411765.pdfIn PDF document text
    • http://congtyvima.com/images/Download/76622712152.pdfIn PDF document text
    • http://midel.me/userfiles/file/megitadasasuvo.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/8858217d4ebf3bace4f678240297fd65/jizidoruvepazevuro.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/pokapitanevibo.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/d83fb3a683e3d12f13ca779c309cc6e2/23740770635.pdfIn PDF document text
    • https://wfbulgaria.com/uploads/wysiwyg/files/mifexok.pdfIn PDF document text
    • http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/29074390597.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5203b81c2b---fokiligizarutexipus.pdfIn PDF document text
    • http://rsti.biz/files/fck/file/lojusudojokajuzez.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/7gtmd2cs7fjun4o64n74tlnaom/nozowuwojufovigonafakazi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+many+digits+is+a+ups+freight+tracking+numberPDF 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_off0000dd4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4D 11544 bytes
SHA-256: edf824d5310c469fc7674b8a7f99a04c32cbe945f93d6236701986ea9be0b540
font_01_sfnt_off0000f81e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11030 16988 bytes
SHA-256: 5be422d6eb1757107239586082142dee784b99c49fa1fda4abaa80f1d8e8f3af

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