Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4dd83096e084893…

MALICIOUS

PDF

86.2 KB Created: 2021-06-29 15:13:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 48ea6f7be18099d582aeb9bd3e28ea05 SHA-1: a1fa81ac782166db788d30c2214797bd22dc38f5 SHA-256: d4dd83096e0848936da477e8f2449a370c73b7068ceab067cca366a02eb8d3f6
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely to host further malicious content or redirect users to phishing pages. The PDF structure and link farm behavior suggest an attempt to lure users into clicking malicious links, potentially leading to exploitation or credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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 http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079705571937---18056006729.pdf In PDF document text
    • http://beta-rc.com/upload/files/daravezisolevixulowadebal.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607440c08e8cc---riketuxupezis.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/93329270b20bb7cbf3fce951a0834735/tapawifadoxe.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3a06c9f54---vukekebogudafuvedaz.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/48fd95cbee8bec1820d1314019e96c7a/25658259201.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/4us3nq1abldi5cairukgb093nd/vobudiguvabowigigaso.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/tezazatazitaliwotu.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/22696535837.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/5022b6eba36a0622de225c8276e3a19c/kuzikuzas.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f5a1b0532---50166624384.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/walizifisefesazapas.pdfIn PDF document text
    • http://dalaichau.com/files/bomojo.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad422733f5---24108973062.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2c2a731bc---8049574030.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608870f93e5e7---sanumabepoxov.pdfIn PDF document text
    • http://sanga.asia/userData/board/file/16481235709.pdfIn PDF document text
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/d9b8e8dv74sraens95k20ee2i7/65583232847.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/79664008320.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a558043ff98---judekidusedulujo.pdfIn PDF document text
    • http://envigest.cz/upload/file/riropapuseziludime.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff42c6aff1---40716310129.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/soxivin.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609034874c22c---17478315337.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/22551208553.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=36+cents+to+inrPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFDB 17292 bytes
SHA-256: fc54ef6458646f03dc767cc5734c7fb6098c45f37eb26f853e3d517778507642
font_01_sfnt_off0000fd69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11580 10260 bytes
SHA-256: f1e5ed8a47e8187f2bae05cc4d387a095159ac5e32d66aefe6c0a4f192b8975e
font_03_sfnt_off00012cb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB2 1760 bytes
SHA-256: 0af9dceed0f7e9db6e10d8e470ed5769000afa0f2270dca3c24bc13d8a18097a
font_04_sfnt_off00013506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13506 16252 bytes
SHA-256: bfc7ce51a1a9b37382af61f0075eb0cdb972126da031002d338643432d80e6e4

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