Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1372c1d14a7debb…

MALICIOUS

PDF

96.1 KB Created: 2021-09-01 16:37:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 37040731fd833308510ff2ab233369c4 SHA-1: 981a400ada36bdca60bd8e30f00d0132d0971181 SHA-256: a1372c1d14a7debbe845cc081aead34304d9b1c2a911eea181bbcc1b6badc6bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the use of disposable hosting and UTM parameters for redirection. No scripts were extracted, and the document body was unreadable, but the presence of a link farm strongly implies an attempt to lure the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • 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.
  • 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://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c42f50157e7---6377764083.pdf In PDF document text
    • http://otoozevran.com/resimler/files/titesinuxika.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/32a4366a258f0f650dc80715f3e01cc8/10088650210.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/9hg5klhldv0dg59j9de79tk2tk/ropuritojiwi.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/91459038128.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/b350d161d497259ea9521e85553699f0/17657032094.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/86474544476.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/69519274026.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/0496ab229d0784c0e5440a7a833e1eae/liwaxazopux.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/d58de36f3c981a9a447aa1453434bc12/bekukujewegowiname.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/f4e7686b9f1a0fa05884128cb412f4dc/32615806468.pdfIn PDF document text
    • http://phutungototuanphat.com/img-tvdl/files/nekasokibepigego.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/51bin14to2v6oj627vesf6q48o/mojexuvi.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1609618ece3be2---bufokugu.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/47035971936.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/25289855673.pdfIn PDF document text
    • http://nato-denkmal.de/uploads/file/wobawiwugufuluvofuxura.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160725db8a0a15---78359043321.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/67958855519.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609981115c92c---63650658623.pdfIn PDF document text
    • https://datajournonepal.org/files/76365494040.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3a8dd781c---72249966161.pdfIn PDF document text
    • http://ddgasul.com/userfiles/file/wifuziwuviretiguxipidever.pdfIn PDF document text
    • http://zionhillfirstbaptistchurch.com/clients/73368/File/bikofebizukevalixegi.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/lasukowosubasibewexig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=the+case+for+the+green+new+deal+pdfPDF 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_off000111c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C4 18100 bytes
SHA-256: 0b2e33c7ac390c2e9a592d55bee7878375a3aa755dec99002e2193ebbe5c18c5
font_01_sfnt_off000140ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15903 10856 bytes
SHA-256: 40a61de9de9e28da7b431db35a8ea1bd8f3356b67bf413fc7b1844454b7cd168

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