Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb610b73cd3747df…

MALICIOUS

PDF

82.9 KB Created: 2021-09-16 18:26:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 998244a36e43d03119c6ce592763d679 SHA-1: 78aae25ec7ac28dfbb8f5ca8c8bcd524c7a2b979 SHA-256: fb610b73cd3747dfe3114f3865b06178bf3a15eef4398f55cb4941b20c75baae
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. The document contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm or phishing infrastructure. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to trick users into calling a phone number, a common tactic in callback phishing and tech-support scams. No scripts were extracted, but the presence of numerous external links and the callback lure strongly suggest a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://allytemp.ru/uplcv?utm_term=adults+only+games+for+android PDF link annotation
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/94b73aa824640e24c93ddedff7fd30f4/38951784933.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210903_968256AF25A18B26.pdfIn PDF document text
    • https://senarathgroup.lk/assets/media/file/10422492098.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-09-10/images/files/fopafigasalusaniloje.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/maredibosonaxipomexuxoxab.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/54242439406.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/povetaw.pdfIn PDF document text
    • http://zekejozsef.eu/FCKfeltoltott/file/12533932057.pdfIn PDF document text
    • http://lonniestireandauto.com/nbloom/fckuploads/file/99124695409.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/gitegovedudebubajesep.pdfIn PDF document text
    • http://hzqzg.com/d/files/fosiberamimakotakegisesoz.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/15466680175.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/namudod.pdfIn PDF document text
    • https://hse.tw/upload/file/sogilaxoxojifejuvoxurores.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/pilaxusefabogiwaz.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/24274778479.pdfIn PDF document text
    • https://wildarium.com/ckfinder/userfiles/files/46738285777.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/letodarejamurixetipilim.pdfIn PDF document text
    • http://wohingltd.com/userfiles/gefiledasejevasamituw.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/nifamirevutujimolupoxipuk.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/05cfac1a4aa2448a47e3027a3cc63317/bavuva.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/87340799616.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/14c002f8f9f3fa25adc93ea30b057418/27496437851.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_off0000e224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE224 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA36 16644 bytes
SHA-256: d9e763c71e3e4f411eac7ca277a0436d024eedd74a21cf63e2da1e4f0ee67d9f
font_02_sfnt_off00012534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12534 10892 bytes
SHA-256: 51ea70d4f9526f982ad8354c97f7d861d02439d190da7a9027cab15a734cecbe

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