Malicious PDF — malware analysis report

Static analysis result for SHA-256 4352ce5336dd6852…

MALICIOUS

PDF

78.2 KB Created: 2021-09-07 05:24:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 98dce6a8ffa4f751b7ffc3230ad0914a SHA-1: 4423b7972e3efe00a88ce861700134b6eea823fe SHA-256: 4352ce5336dd6852df23c3ece5c18c752006a5f5711794b317816f2675464dc3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, directing users to various external sites. Heuristics indicate these links are likely part of a phishing or malware distribution scheme, with ClamAV specifically identifying it as Pdf.Phishing.Trojan. The ML classifier also strongly flagged the PDF as malicious. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://queure.ru/uplcv?utm_term=identitas+sosial+pdf PDF link annotation
    • http://cablexconsulting.com/Upload/file/62586198410.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/9d9e89f75f5c6d25e73d92d3e62dd092/talurevapebewovurefipi.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/a2c0387969cd4e6cc9a657b059a453a5/bavagusosumogubiwepojeben.pdfIn PDF document text
    • https://hgb.se/filer/file/nekepebebosejaf.pdfIn PDF document text
    • https://mauspro.net/upload/files/14073623756.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/f782bb20d52d497cd10db3c4edc8387e/bugivejureru.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/ae4ff19b792b5742a2af808ab4bf725d/79751887241.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e8fbc6fb8---79989284367.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/nuvowizugosilos.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/84161251566.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/wijuxovevawoxufumomev.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/14686391554.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/pezito.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/guxovejoronuwunaxuf.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131219d1bc96---wewofinawanulimulojumodaz.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ceeceaf8c8---pevonabasu.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/tukekolisotefod.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160decc45b43ce---gixelususufumoka.pdfIn PDF document text
    • https://gtijsr.com/userfiles/file/dofefut.pdfIn PDF document text
    • http://josephlillianmorrisfamily.com/clients/59960/File/norizejife.pdfIn PDF document text
    • http://henri-ruch.ch/doc_pub/file/tiwilakegerodavunemomu.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/9fadd08e5f9ab7b1ff3695628359bdeb/32601149022.pdfIn PDF document text
    • https://juraganmonyet.com/contents//files/mivexifoworo.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_off0000cdd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E5 17764 bytes
SHA-256: 3b22bb11bff651103cd3c00e393a1314a7fac26aa67a51f6d028502d8005d81b
font_02_sfnt_off000113fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FB 10344 bytes
SHA-256: 4230208f9a2210e5acfd4eb124efe78ed370036f37dc39fa5595de3c34526d65

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