Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f6df1cb757ccd9b…

MALICIOUS

PDF

98.3 KB Created: 2021-09-02 01:06:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0dd4be944597cbc6c21da5ec193822ad SHA-1: 976451c42454986a68cf44bcafcf91604d992f01 SHA-256: 6f6df1cb757ccd9b74513b964970b548227a4b535869ef0906d244f7f6c82c00
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress upload directories, suggesting a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7226bb4a68---xoseluponipifujalijozo.pdf In PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc5fa74b1b---28182735211.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/9768279514.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/89781327604.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/5afaep0bqp3n2ard7lgvfm1lus/vexeguparug.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/mdvj39vhu2b0f1e4joqc5atn45/kunonaxepojidosibomutobo.pdfIn PDF document text
    • https://karlschool.org/uploads/files/202108260743349002.pdfIn PDF document text
    • https://yuss.it/file/5703035251.pdfIn PDF document text
    • http://veitali.com/upload/files/meguda.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/6d7dfac9e603601ff900eee9c09820f4/12517648753.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/dotuvipifoxigixizal.pdfIn PDF document text
    • https://qnzar.com/files/xovilu.pdfIn PDF document text
    • http://songiadabinhphuoc.com/upload/ck/files/59859869300.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160900061df01a---59887264374.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/susowotemujoxoda.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4616975c8c---90845954851.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a63f1b502ca---3587675951.pdfIn PDF document text
    • http://sivam.pl/files/file/fasaxezemolizopet.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/51261362558.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/31577516230.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/5cf34aadf92132ae07c5ed3a7aa5769f/lezon.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611760d105cd3---81213753477.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/529278672.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/991b1e9dc8e8aee5dc45da2140297070/baxugirubavolatepuduwas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=pure+and+hybrid+orbitalsPDF 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_off000114f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F4 20080 bytes
SHA-256: c59573de3cd07b30a61b6a6ff3f216a3cfcce99607e95046b1133cd6e032441f
font_01_sfnt_off00014a0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A0C 10700 bytes
SHA-256: aa6a1e6d071563616dd644f2a67809947995f9a3b354bfc84d8c956f113f788f
font_02_sfnt_off00016283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16283 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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