Malicious PDF — malware analysis report

Static analysis result for SHA-256 b516a327717117fc…

MALICIOUS

PDF

101.4 KB Created: 2021-06-26 15:58:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bee3955e6c0118bc14f101e10efa0730 SHA-1: bceb16abe552b34cce3c1ce3042c2e5ef3a89a95 SHA-256: b516a327717117fc01d308a2a3e4691fa91cbbdb47b0ae07552da60a079c79b2
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://allytemp.ru/uplcv?utm_term=uncontrollable+tremors+in+legs
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/7e2d62b968a870531f8a3dd2e075cd2c/nidumuguribavofukub.pdf
    • http://premium-h.info/files/files/doremifijexopejojapuf.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a1922d55707---27007308954.pdf
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/kqpbqokmeclemu6pqgu92vpn00/wusukusiwivo.pdf
    • http://ingmontagna.com/userfiles/files/razanafudugaganasijoj.pdf
    • http://bsp-oblspl.org/ckfinder/userfiles/files/mewebuturavenatugenirifi.pdf
    • http://bouncebodysupplements.com/newerac2c/userfiles/file/34585847387.pdf
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/g61flnusulnth6mu2v18feehk2/fadizuxetimomunumenebuni.pdf
    • http://geredekombiservisi.com/userfiles/file/54740429823.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/uho4taod3jn0rag087jlbdrri8/zixesabusagoketodufare.pdf
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/nesiperabijogad.pdf
    • http://hoctienganh123.net/upload/files/39994709967.pdf
    • https://fundreamz.com/ckfinder/userfiles/files/davekorapojidepa.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607de796e52ce---futowud.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/meuu9rchljgfg2ouvs147rc9ai/16193946831.pdf
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/4f180593b2d087ced8fdb2c3be7bef24/88074880046.pdf
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/1170b859ece7afb3c9418b3790a59229/57028817150.pdf
    • http://quaker1960.com/clients/3/34/346d0055920ff30d27c63167e405b0e7/File/59610401988.pdf
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac53c04d909---87908359456.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/66gvjlesg0l0k27qp43v7v7u5a/pedevidawegugopivunodet.pdf
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/677b503c6fbdc651e4bed3659c3ea5eb/nedurokinilagudoxas.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c5393a02ac7---digux.pdf
    • http://wsystem.sk/userfiles/files/52951028470.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16097f914da664---81208718875.pdf
    • https://medlineplus.gov/tremor.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012cf9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF9 16792 bytes
font_01_sfnt_off00014510.bin
30c11a2810c42b82c7456e26a12d8892c76b7a329fc0fc4fdbede6a608d33128
pdf-font-stream PDF embedded font (sfnt) at offset 0x14510 10720 bytes
font_02_sfnt_off00015db0.bin
1331907e214c7d5773ecb4954f882e925e1b83f4abab755ce30861e099610a82
pdf-font-stream PDF embedded font (sfnt) at offset 0x15DB0 16524 bytes