Malicious PDF — malware analysis report

Static analysis result for SHA-256 87f00419aa977409…

MALICIOUS

PDF

83.6 KB Created: 2021-09-07 01:29:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 54f2fefa52a2bc96d47c7f037137db10 SHA-1: feced73cd6ef677c87169834fff38b85e9a4d8aa SHA-256: 87f00419aa977409c9a2680f883b06c8caf88050a217602e2a7aaa3dffba2b9f
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple PDF files hosted on compromised WordPress sites, suggesting a phishing or malware distribution scheme. The presence of numerous external URIs and compromised CMS upload links strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/39ba169c2eb206c503bde1c15c55f35d/33429192664.pdf In PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/809b055494ae5d9ff208b44f3f25df42/fegijore.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1611aab6af1ba2---68525352894.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/kixosi.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/43755127510.pdfIn PDF document text
    • https://chornakorn-packing.com/ckfinder/userfiles/files/nekabinopudimavibisisake.pdfIn PDF document text
    • http://loaamtran.com/files/usersfiles/files/somozewebib.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/nogedapepazil.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/kafulutewozaforimu.pdfIn PDF document text
    • http://71mhsreunion.com/clients/f/fd/fd19d29f3ef40f7e1d0269d1df38e7d4/File/vatebesap.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/91780126777.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16120654e698d0---24588264736.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/41166727324.pdfIn PDF document text
    • http://charivne.info/images/file/butewabewuzezigujasu.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/l15qajlp3i1eo25lfn1m6p4j1c/towigadodikigizi.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087b01469a81---10250310833.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/6bf4f543705e7d02dae940a352b68204/mowanafelov.pdfIn PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/gatuvamusemufe.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/oeseck0c6v87k1kjf8um0en93k/52161270646.pdfIn PDF document text
    • http://absigorta.come/file/52265431085.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/53ef8a0354d453a6022ac49dc689f87c/45853836398.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/f02225045e80b63d53aade6e19076669/76542921961.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/salemuduvewavovadajokizob.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081184608890---49637951382.pdfIn PDF document text
    • http://phatnang.com/media/ftp/file/86020300574.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=inference+practice+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_off0000e216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE216 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2D 10228 bytes
SHA-256: 21dc2f259776ef797c8f8f7af989c27d32489f25993a3bc9325b354fc605d1f1
font_02_sfnt_off0001113a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1113A 18496 bytes
SHA-256: 03da041448bb89daed7e8e7e4dc537dcda70423d9753dec77c38845d8dd17b74