Malicious PDF — malware analysis report

Static analysis result for SHA-256 331f3852b86545f4…

MALICIOUS

PDF

78.6 KB Created: 2021-09-09 09:32:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8e2b55a4da6367415079c35a2ba54bee SHA-1: edbf9b114fed765b6eec749a52c155a7d22a185b SHA-256: 331f3852b86545f40bf5797fd4346dea91e86eb26dd91a2ebfa3154ba83f7f34
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://inwebjor.ru/uplcv?utm_term=how+to+play+terraria+multiplayer+on+mobile PDF link annotation
    • https://kiaavcilar.com/upload/ckfinder/files/dezufewigev.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/wilibesorijofasegifalu.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/79720060637.pdfIn PDF document text
    • http://khonggianmang.com/upload/files/kejukiruduxirebinebabefiw.pdfIn PDF document text
    • https://bomnuocebara.com/quangbasanpham/app/webroot/upload/image/files/54689031794.pdfIn PDF document text
    • http://tochuchoinghi.org/files/luraruguborofe.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/1630669808266.pdfIn PDF document text
    • http://nextlab-semi.com/files/fckeditor/file/vafunej.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/tulesudexixowutowaso.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/50981867739.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/kusunivuziru.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613724e1dc75f---wazolijilegogup.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210901061015.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/ribuwoweruropanal.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/wateb.pdfIn PDF document text
    • https://kompaspt2.com/contents/files/98665081716.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/lepoluko.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613566abca07e---sakepipi.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/3e045d2378bbbdef8b97070cb7044f27/wiwusofukixonunonumoz.pdfIn PDF document text
    • https://vocembalo.ch/userfiles/file/63533798630.pdfIn PDF document text
    • http://bukharasuwanee.com/sites/default/files/file/sukefiforafujabopux.pdfIn PDF document text
    • http://retailcop.ca/files/miwumevalexinidakozokafe.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613002cb9ed22---satudojamum.pdfIn PDF document text
    • http://kristiankutschera.de/userfiles/file/fizate.pdfIn PDF document text
    • https://callmarkinvestments.fortunekenya.com/callmark/files/mibujow.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_off0000c740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC740 20080 bytes
SHA-256: f9727fbc4856038061f19853b36efefabbc959ed9262f34b6b16f42d8c33eb57
font_01_sfnt_off0000fc11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11428 10676 bytes
SHA-256: 0c608d1be181a316dda58ee2ffc4a132115e8476ce467ce9995db8d0a4f8c2eb

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