Malicious PDF — malware analysis report

Static analysis result for SHA-256 b26d270b2faf6e36…

MALICIOUS

PDF

88.8 KB Created: 2021-08-13 04:28:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8125c4cb069bf3cbf8a7029f5566c560 SHA-1: 4ff97059c04c590aebfe7501dc56842be8ffd3d0 SHA-256: b26d270b2faf6e36501cc957ff2b7f78e60bfd114349e67102e776d4a2ce999c
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress upload storage locations and disposable hosting, suggesting an attempt to distribute malicious files or redirect users to phishing sites. While no scripts were explicitly extracted, the presence of numerous suspicious URLs and the high ML score indicate a strong likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pusancard.com/userData/board/file/11006336789.pdf In PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/sobexogadenudet.pdfIn PDF document text
    • http://emannsltd.com/userfiles/20823931211.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/regumodadolimodo.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/tawofeji.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160815185e1078---talojux.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/061c80f09bdbb5e76da0ea4cdf05b94a/43996607031.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/20423959327.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/ldkoggj1nj0al9f738ulmrtsfb/47678528685.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/xilozawisaga.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/prbml367dq8odcaipt4ca0jkof/telubevuvekararuforajiku.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac936cf490---veluremorodisimubib.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/2293984967.pdfIn PDF document text
    • http://xtra360.net/campannas/file/6742289845.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed9064e856---binozis.pdfIn PDF document text
    • http://abpaluso.com/upload/file/dibabuvigozefukazepuja.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/13253067734.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/mru4fkc3ddq2k9l15pn2r00am5/mefuwagufufovubuw.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/3079381f1c9fcdf9eb43570b733039b9/42833283610.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f753acc2b2---vidoliwapevekejibit.pdfIn PDF document text
    • https://carcable-bg.com/uploads/pictures/files/lotizuvixofizumanumopodit.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/20745770514.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16092c92870cc1---12599563314.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d49f90129---jejuza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=calculating+retained+earnings+on+a+balance+sheetPDF 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_off0000f77a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F8C 16812 bytes
SHA-256: a638315238c479efc15b9f57b90b69c123a73af1a1223c9440d0d8b2521ac3c6
font_02_sfnt_off00013b7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B7F 10920 bytes
SHA-256: 5dca37be0b5fd8fae223a8cac88674aa216c4ffee144ac2e7ad45af76507b7bd

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