Malicious PDF — malware analysis report

Static analysis result for SHA-256 d174298ca1ea28fd…

MALICIOUS

PDF

107.3 KB Created: 2021-07-07 15:41:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ea5519b99374c946b172de0826f6d660 SHA-1: 60db44569e2e5ab524834490aa853bbad4ef264b SHA-256: d174298ca1ea28fd6aa9c2864a316045af242bcfca214907c28e60e5d22ed29d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the heuristic findings point to a malicious link distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

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://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/d6i3j7qgg7bmls160rtd92suns/tepipusujuvebebezovob.pdf In PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/buzekelononos.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/53989706905.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/id595n6jotb92sult5j9pdrb6d/pafuwotawoxukupenalo.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085087e9422d---82990900004.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/fuxogola.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/gi2k5m7p1f3898g2lhd7ftr524/gunibobofaredujowe.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7c612e487---zufivawego.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e207ab233---mufavup.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607c010543945---xufeduruvoli.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/movidukilo.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e07c7d8305f---sevudodakomo.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160af389db2130---69327230021.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/mevaputubimidivododogudop.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/i7a72le2uf47ovg3vb1qdc9ri0/89529787171.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/8ct4u6ki9b2scoa9rf8c6u0maf/84002518643.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e80c1b7d11---82375607910.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/colovjbkt1cosvo50fbp38va80/mizawerezibogutogu.pdfIn PDF document text
    • https://x-software.cz/data/file/mojukikuxevepiwixowaso.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160722536e1f55---jolimiwuxukufonumiru.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/2k5e6f4et33qnocrb8ir938517/konusefuzu.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609dede0dfc38---34431026024.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/c18cad4936e5272cd99485e1cef7a35c/9157749586.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210625_F90BCFBC1E889353.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+write+an+exponential+functionPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000124bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124BF 18908 bytes
SHA-256: edd02d5b6e025eb0c6efd680fa46638044de2f3ab61b75e0107ec0e314df49fa
font_01_sfnt_off00015782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15782 16180 bytes
SHA-256: a67eb2440863efe6f5a092f3136647d8821824aa17949d2a9e00b55b6caa8487
font_02_sfnt_off00016d17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001852e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1852E 10584 bytes
SHA-256: 3672aa90b6b8593e571e3e9971300de1717513bbd0b18892187019abde27b9e6

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