Malicious PDF — malware analysis report

Static analysis result for SHA-256 d81f09e6f98e0b27…

MALICIOUS

PDF

83.0 KB Created: 2021-09-16 04:58:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 47e5910df00392e9be0d7d89e9f693bd SHA-1: 2e400d060146a1327600bb815a10d9e7241ff4e6 SHA-256: d81f09e6f98e0b27db4e493cbfd6ede24b09e3c0b4169aadda9dcc50e57f4586
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to domains associated with link farms and potentially compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure suggests the document's primary purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://infrive.ru/uplcv?utm_term=objects+that+begin+with+l PDF link annotation
    • http://thehedgerowchronicles.com/ckfinder/userfiles/files/binadabepufif.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/majoxupuxo.pdfIn PDF document text
    • https://protraderin.com/userfiles/file/bigunibefexaxutu.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/e7dca3205b5472c577daf814a0b3eb6b/79864938519.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/88120838012.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/2225764761.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/c0bg6p4efnefa79sbbhr7b02sh/kuteponolagupobukekisob.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/pipadek.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/3p8njqcbg71jh6los7o7m61tr3/31101056625.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613371b626cbb---sefujomafufarow.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16139c3dd77a5b---11434522364.pdfIn PDF document text
    • http://makrostal.pl/user_images/file/dodabujelotalagas.pdfIn PDF document text
    • https://anglarill.net/userfiles/file/26832850057.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/76325341808.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/58233600006.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/fosufifug.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/novefaxonabowuluw.pdfIn PDF document text
    • https://mimpiindah88.com/contents/files/4640727161.pdfIn PDF document text
    • http://lasermedia.cn/userfiles/file/76057615641.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/d90c22fb58f25ec5385ede59c18f679f/74157252324.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613f47e8c3b4e---mudowewaviv.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/wefusepezuwikiwobukoxa.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8b3bd6045---75751949215.pdfIn PDF document text
    • https://emtracing.net/userfiles/file/51957792603.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/zutuwamuselevopedum.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/38358100267.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_off0000e240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE240 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA57 10672 bytes
SHA-256: ecf75caa3124800450b9b3fc7f7c3943d83a57a7ca7cf8ff42e3f3c60fb54400
font_02_sfnt_off000112d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D5 16968 bytes
SHA-256: de07c9bfab88630f6d07d312abe40c6a5b2e51dad60f7bbcb44d94de6c09808a

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