Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9facca5d7c8e20d…

MALICIOUS

PDF

81.4 KB Created: 2021-09-18 18:46:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0bc8463361b04e6a1ddfc8e0527d715f SHA-1: 52d49e04c4b80a191869e4df6ad83e5931c1054d SHA-256: a9facca5d7c8e20daa8c5cbec647f6a00bbb313e4bcb45c53459ea950ab8eba0
196 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 or disposable domains, indicating a link farm designed to redirect users. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, along with ClamAV detection as Pdf.Phishing.Trojan, strongly suggests a malicious intent to distribute further payloads or conduct phishing. No scripts were extracted, but the overall structure points to a malicious document delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://laborke.ru/uplcv?utm_term=play+mini+militia+online+free PDF link annotation
    • http://honeycontacts.com/uploades/userfiles/file/tonezu.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0d891bae5---girezuwodi.pdfIn PDF document text
    • http://olympicburger1988.com/uploads/files/wumukako.pdfIn PDF document text
    • http://svarovani-tig.cz/userfiles/file/95161824148.pdfIn PDF document text
    • https://www.shropshirefurniture.co.uk/admin/ckfinder/userfiles/files/21481911100.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/kipizoxixero.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/puzaxiwi.pdfIn PDF document text
    • http://rklatex.com/userfiles/file/birogopaxezifu.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/168324676.pdfIn PDF document text
    • http://darslaska.org/ckfinder/userfiles/files/84716637029.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8199476f1---68921617009.pdfIn PDF document text
    • http://olympicburger1988.com/uploads/files/15426505698.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/9592449832.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/dosoxef.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4d4b06109---mudofonipiwadumifo.pdfIn PDF document text
    • http://luxlustry.ru/img/upload/zupadoxef.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/tanagokigavubiluseva.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/50516071852.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c1ead8355---lejidufezobodexixovasipas.pdfIn PDF document text
    • https://sanmuabancongty.vn/images/content/files/53598873540.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/nevogaxa.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/33850683147.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/tiwuf.pdfIn PDF document text
    • https://msiutilities.net/documents/rakepijewuvuw.pdfIn PDF document text
    • https://kotypsy.pl/ckfinder/userfiles/files/59802296418.pdfIn PDF document text
    • http://plantessentialoil.com/upload/files/tapirokufakuko.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_off0000dca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA5 17024 bytes
SHA-256: 523ce2ffed9d3824ab464f159003db672067c7c0c6d996dc9bb989cf1c8f13db
font_01_sfnt_off00010853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10853 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001206a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1206A 10324 bytes
SHA-256: 0f0271124bda09e48dbedadc1da77edebfe207ad3080b7ed9e4a99dd1a47a3bc

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