Malicious PDF — malware analysis report

Static analysis result for SHA-256 33a1559b16728a2e…

MALICIOUS

PDF

81.8 KB Created: 2021-09-08 06:12:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3ec4f81221a04c5b648f34ef35f8d950 SHA-1: 670372f51da56e6cfe77e8f10940e7a9efabfc24 SHA-256: 33a1559b16728a2e16f3518851a1af51f47d5333d12dd853342bf3dcaf368646
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress upload storage, a common tactic for hosting malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e094501f18---5681207821.pdf In PDF document text
    • http://landpas.pl/upload/file/gikidapave.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1611118ae22c0e---30771762440.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b0a9d38c1---gemoga.pdfIn PDF document text
    • http://restokrat.info/userfiles/file/85371939403.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160972550ea90e---tijowipafazasebebo.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/47506571426.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/fo9igb87187ngi29ehn5ufj562/kamupenawixuzozusol.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/66005609517.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/19027717570.pdfIn PDF document text
    • http://cualuoiskydoor.com/webroot/img/files/85516914901.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608123fc7d4d7---61605522294.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/xumuvoloxilaxisarugen.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a224367c7de---dowuzowigeliponova.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610acf192479f---vawinov.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/revetaropisafakawuzebab.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/nipafozedokitovopukefoka.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/midazona.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/88448034719.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/komesem.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/8ed0454d45383dbfa46eaf0171ac32b2/satunigapuwima.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/8de2pq1csupr390hepi8cmfao8/galisutepuxifukini.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/8320849502.pdfIn PDF document text
    • http://cpspcb.com/uploads/files/tamugarexi.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/gezewijitiviwezerof.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cd6c791d534---pugopubinibuzal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=2015+gmc+terrain+sle-1+owner%27s+manualPDF link annotation
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/25735549140.pdfIn PDF document text
    • 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_off0000d8df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DF 17344 bytes
SHA-256: 08715705cb215b284827f624a3b40eb4e1f86f3b4e59b5b9129922f83dede9ca
font_01_sfnt_off0001058a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011da1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA1 11160 bytes
SHA-256: 7e1fa9bef925710d2e178c38258c402bb016dd50cb8c58cb2dc832f5ad745f9a

Open this report in the interactive analyzer, or submit your own file for analysis.