Malicious PDF — malware analysis report

Static analysis result for SHA-256 644bb1ba14ebc202…

MALICIOUS

PDF

92.8 KB Created: 2021-09-05 16:14:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3431912ea2f1d91e83bebd90a4d7b654 SHA-1: 48e3957ca730fd1e20f4a004cec245afbd56f3e2 SHA-256: 644bb1ba14ebc202de6102c39f6bd24c3d2ce37d9132c62b1887ee04a4cf534e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous links to external websites, many of which are hosted on compromised CMS upload directories or disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to distribute links across various low-reputation hosts. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or to serve a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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 https://archism.ru/uplcv?utm_term=esab+welding+machine+service+manual PDF link annotation
    • http://sibmetiz.ru/upload_picture/silutukozupikonex.pdfIn PDF document text
    • https://crc.creativechange.net/ckfinder/userfiles/files/kalamod.pdfIn PDF document text
    • http://elitacasa.it/images/file/46692001540.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/diwum.pdfIn PDF document text
    • http://www.insight-assessment.com/ckfinder/userfiles/files/bigidusarejibawil.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc1c901ffd---58826926730.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/masajujowidovomapak.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/13477132532.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/9ulf38ov7ra45l7fpf4hc0fddt/kudawile.pdfIn PDF document text
    • http://195exim.com/datas/files/rewimusogafolavapago.pdfIn PDF document text
    • http://vkp.ru/upload/global/file/nuwaxa.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/zuzogalusidijovegopalim.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/38821220372.pdfIn PDF document text
    • http://www.alrafeef.com/faisaliya/js/ckfinder/userfiles/files/ledisovupor.pdfIn PDF document text
    • http://rrarental.org/upload/file/94202393336.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/21333711909.pdfIn PDF document text
    • https://t2sc.me/userfiles/zatewikepuvutavarinofikix.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/javoguvexir.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/cvu9mctm5fuc5k4qu1e2q8tu0j/nefajazeludeb.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/33732869984.pdfIn PDF document text
    • http://thecuriosityshot.com/vabikowusawanajajuweb.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ec62c4e5d4---53371292811.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/zosub.pdfIn PDF document text
    • https://silky.ae/images/bulk_images/files/pixudipazanojor.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132a6dd83372---95659289885.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/nafanasugeko.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160960261d40b2---duvutipiwadogixatiruro.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_off00010118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10118 10972 bytes
SHA-256: e50dc4e91a1756a41074d483a2f519e32795621fc328fe08f907c5c3417ae105
font_01_sfnt_off00011a22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A22 18944 bytes
SHA-256: 2efabddafe081067580f3899f6b85f543295939c2ea3dddeb33c53f1148b62e4
font_02_sfnt_off00014b75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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