Malicious PDF — malware analysis report

Static analysis result for SHA-256 74e993e4efa1443c…

MALICIOUS

PDF

81.3 KB Created: 2021-09-19 10:10:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 273d1f60a5febc6a0323fbc7cccb2587 SHA-1: 5585ded8c2c6ace721b7fbb72cda40ca88bc1bad SHA-256: 74e993e4efa1443c41ffa6b74b8241a0eeebe29b98731488d9134d1b95ff291c
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as containing a link farm and was detected as malicious by ClamAV and an ML classifier. The embedded URLs point to compromised WordPress uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further indicating a non-legitimate purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://wastran.ru/uplcv?utm_term=how+do+you+transfer+internal+storage+to+sd+card PDF link annotation
    • https://icrs-as.com/userfiles/file/namijalagokelurexikebixej.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/91196326540.pdfIn PDF document text
    • http://gocoachfox.com/userfiles/file/pijazibuzefibej.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16143520551769---jokevijedeputafin.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210904_042043.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///telupa.pdfIn PDF document text
    • http://canissapiens.com/images/uploads/file/kinitajifo.pdfIn PDF document text
    • http://rassadaspb.com/new/files/file/67057972201.pdfIn PDF document text
    • http://beganijewellers.com/ckeditor/ckfinder/userfiles/files/20908449349.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/79708197582.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/xafebasusax.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/4uidb38n5v6t24tqsr91ubp15k/vujiginunebinamewonumolu.pdfIn PDF document text
    • https://dabanbep.tanglehadong.com/upload/files/joxaropobalevozekibita.pdfIn PDF document text
    • http://pilatesmystyle.com/userfiles/files/34724407017.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161466cf914130---veposezoxaxowegurimawab.pdfIn PDF document text
    • https://przygodanaukrainie.pl/admin/ckfinder/userfiles/files/duluzegumosokifep.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/58351390214.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/sexiz.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/mesosexe.pdfIn PDF document text
    • http://luligang.com/ckfinder/userfiles/files/belazibiv.pdfIn PDF document text
    • https://www.solucionaesp.com/ckfinder/userfiles/files/rebitebixuganer.pdfIn PDF document text
    • http://henanshuangxin.com/d/files/22106615213.pdfIn PDF document text
    • http://gajagotour.com/UserFiles/file/24029994239.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/19540297434.pdfIn PDF document text
    • http://konditsionery-odincovo.ru/upload_picture/file/33611677944.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_off0000d81c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81C 10940 bytes
SHA-256: 1a37cccbc36e4a4b80c2aad0fb0b9a791a0e16e98179699f6e99217eaaea9b9e
font_01_sfnt_off0000f16b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16B 17708 bytes
SHA-256: 18f00dea6c36146213da12e674a258fddd6ff19c89aa31727c358cc7c3e87ec7
font_02_sfnt_off00011f1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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