Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcb0b6cb5d52fd89…

MALICIOUS

PDF

83.5 KB Created: 2021-09-21 05:06:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9a5d80a005fffc281928d5ff43db817e SHA-1: 990d66d733d8f7d5dff70360d8b51b91773bab20 SHA-256: dcb0b6cb5d52fd89a7688353353a41d4224b7b32a7b08f7ca3f79451ee1a23a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, potentially leveraging embedded JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • 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.
  • 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://nomylo.ru/uplcv?utm_term=legally+blonde+theme+song PDF link annotation
    • http://capmar.eu/userfiles/file/82528790594.pdfIn PDF document text
    • http://xn--80adib9cjd8a5e.xn--p1ai/i/upload/files/93090522931.pdfIn PDF document text
    • https://mytopics.it/uploads/file/tufubupebazisefusat.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/99227013382.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/papadujotafutuwojuz.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/50764173003.pdfIn PDF document text
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/vovuvirologudumika.pdfIn PDF document text
    • http://micruts.org/userfiles/file/begotolidoxofikudavebun.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/mexalike.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/83586822664.pdfIn PDF document text
    • http://potya.com/waxiraloziwetopuzibasa.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/nidexof.pdfIn PDF document text
    • http://zuche0551.com/upload/file/34968658503.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/lumujejakif.pdfIn PDF document text
    • http://wuyioutdoor.com/userfiles/file/57127199595.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/zesajufavakakekorug.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/nuwisewegef.pdfIn PDF document text
    • http://knipia.com/userfiles/file/rodevigipabozamojodax.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/72207973107.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/tusegizirutakofexar.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142481c5fbdc---vabevetenajukosawipija.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16145ff40ad2d7---109410107.pdfIn PDF document text
    • https://renewone.de/files/rogaroxewalebogodas.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/vivixixojizulowitokogiku.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613502acc0503---tujubelif.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/sododosufudawelokujefe.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_off0000e008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE008 18592 bytes
SHA-256: c769490c02e582cf07e2a1876a1a02147f5a5a2e8ba342a41598213291723910
font_01_sfnt_off0001101d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1101D 10716 bytes
SHA-256: 4d9b942d2af0e3ea0bd74686c085621615a8481af5d4a229b7791a15efa58cd5
font_02_sfnt_off00012858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12858 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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