Malicious PDF — malware analysis report

Static analysis result for SHA-256 f280d39ea1f83bfa…

MALICIOUS

PDF

87.5 KB Created: 2021-06-27 09:01:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e9b998357470c71e0af753268bfe0fe6 SHA-1: f5f87e483d4fa0094dc73acd9cae690bbd3ecf10 SHA-256: f280d39ea1f83bfa2f5a95e8f4f63e58b7c06946eb8b737284b3e99dd30d9e84
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links, many of which point to compromised WordPress sites utilizing formcraft or super-forms plugins for file uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns suggest it functions as a link farm to lure victims to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4d3f06c31---volirugavesesunijok.pdf
    • http://hitecds.com/userfiles/file/82446970220.pdf
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/bacf2a87b14f4d92edaa6bb027167f2f/rojipok.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb58bdeea2---79372567590.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d7ce50b8211---26053207435.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/c8240cf0d1b821f5c7f174526897069d/8496296106.pdf
    • http://thingsantiquesla.com/userfiles/files/jetakabiza.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071018c4d844---44305649420.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2e2e5e073---64526652525.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f59ba0cd1a---46339576603.pdf
    • http://beloit1962.com/clients/8/83/8368a4f838dea3176655029ae9e337da/File/biworogorugijadidad.pdf
    • https://adepotcustom.com/UploadFiles/file/20210507053826185.pdf
    • http://ackerviewguesthouse.com/userfiles/file/86339374195.pdf
    • http://dianacb.cz/userfiles/file/ridomenegerosi.pdf
    • http://stolizstekla.ru/userfiles/file/95435453964.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8a1543150---xarovatuxisifuvefemigawu.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/55adksc4d01v5747g91pu5qugo/51570283553.pdf
    • https://giolog.biz/images/bulk_images/files/35335791805.pdf
    • http://kaies.cn/upfiles/file/47299761667.pdf
    • https://monyetmesum.com/contents//files/61162110002.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/c54db72cf542b0aa604e3e84a816ca16/lipararonapujogewutifaz.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf3782b857---31086029063.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3831af277d---88618324687.pdf
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/bf4b13088d54f8554c336969a4e303fd/wabapolunoro.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/90a32a44783cd555fa3001649152850f/87658716787.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=hooded+eye+surgery+before+and+after
    • 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_off0000f2da.bin
e38b98429fceea489e4f53727b25075c217432e6ad85dc557896d7abb01d255c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DA 10736 bytes
font_01_sfnt_off00010b70.bin
77d1ac663c20fc860d23f1b5f2c9f09068bbdc0bc72cbbbb5072ea2a2eecb11d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B70 17200 bytes
font_02_sfnt_off0001385d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1385D 16792 bytes