Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c1fafdffd886b36…

MALICIOUS

PDF

74.7 KB Created: 2021-09-19 07:06:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3398c7c9e3d05ae8753a58b0fc5d938e SHA-1: 24e9d410944ef6b65b08d0ad251d6d18e23f0da9 SHA-256: 9c1fafdffd886b36804dc4c11104198c2ea670263178f2148ee3abf22ff56891
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The presence of numerous external URIs, many pointing to potentially compromised WordPress sites or disposable hosting, indicates a link farm designed to obscure the final destination and potentially distribute phishing content or malware. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://yesfabric.com/images/upload/File/puluritabisuxowedo.pdf In PDF document text
    • http://xn--d1achljw0b.xn--p1ai/content/upload/91352087559.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/2d0ee660d07b4d424630be7abf387359/bopejozekuzixiregol.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-9-16/20210916171015744864.pdfIn PDF document text
    • http://air-ned.com/uploads/files/lebuj.pdfIn PDF document text
    • http://kayapalinakliyat.com/file/68934325911.pdfIn PDF document text
    • http://trungtamdaykem.vn/Images_upload/files/nibemiviwomezukerim.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/f4a0cf5ec0bba47649443e939f0274dc/78713006979.pdfIn PDF document text
    • http://lynhuagiasi.com/Images_upload/files/66991021014.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f48c507c9e---86774233997.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/42617746464.pdfIn PDF document text
    • http://rockefellersgold.hu/editor_up/67385043552.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/79546406169.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/vamisew.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/36473386459.pdfIn PDF document text
    • https://grandegroup.net/files/zotomamadabomejiruwuzulum.pdfIn PDF document text
    • http://mmbassisiprovince.in/files/js/ckfinder/userfiles/files/20301894188.pdfIn PDF document text
    • https://ostrichtours.com/ckfinder/userfiles/files/tudujakevafomilunu.pdfIn PDF document text
    • http://wsospice.org/uploads/userfiles/file/file/tetakutoxodoreju.pdfIn PDF document text
    • http://primaneighbors.com/userimages/6278167774.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/menuvunexijelugu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+do+i+find+the+ip+address+on+my+phonePDF 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_off0000c263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC263 10908 bytes
SHA-256: f3bdd47199e8f15b2e5451e9915811e06a4d26a577e247e0441b637c00d57b6b
font_01_sfnt_off0000db77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF389 16164 bytes
SHA-256: dfd8feae03f308ee4e453f384b8ec489d3aad6cbda56c049ed5904f41f47f672