Malicious PDF — malware analysis report

Static analysis result for SHA-256 edb9a67c51ffe2f6…

MALICIOUS

PDF

94.1 KB Created: 2021-07-07 23:08:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: c4bfa434aa39209f799f1c4856a61297 SHA-1: 42f300abaa5e31ed4e6939d835fa954c2fa15a64 SHA-256: edb9a67c51ffe2f65d2bdf41205ad02740005ffc7a959dc05c8257668974b412
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded links are indicative of an attempt to lure users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16078af4e36a8e---20093177389.pdf In PDF document text
    • http://laros.cz/UserFiles/file/91144781708.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/40045690054.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/ko07j22565s8j04hh7pg9k6bv1/43632038825.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/a5a77783dd6631bbed378269cc2150e1/12823520133.pdfIn PDF document text
    • https://maplesservice.com/wp-content/plugins/super-forms/uploads/php/files/f2c07a3708c120ddca7d56a0d6710d69/24668754280.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a56e66540ab---30862296508.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/65384376840.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834a76b474a---zonevapevijomuvopa.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/52a9dabb2fe5c0f3e5e4e03b83f32181/gukuredozaponavobeb.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202107021920289590.pdfIn PDF document text
    • http://stylekd.ru/files/92135448769.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c41d42139---gubobulerozulunutiw.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/69ab690a672e5421df90b0f15de768bf/mipakosekolufaxiduwenuru.pdfIn PDF document text
    • http://dongkoo.com/uploads/editor/files/xumujedexarodewulatudu.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/tiwofugabinukavosufegaxap.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/b03f3cd24427a672c33bd873d3bb9dd0/fusuvaxibovufogu.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607acf0747c26---18162825715.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/13622069675.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/51521201783.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2fc87eaa2c---wexasegesupagoxoj.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/hqe680mev62mgivh1kvuijdapp/48939473528.pdfIn PDF document text
    • http://staples1981.com/clients/b/ba/ba027a536d51c1d997ee76cae6dc9017/File/28621491513.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=fun+tricky+riddles+with+answersPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12389 17988 bytes
SHA-256: 8367ffd94c9fe458c45c64384a8841bfb2f9b6e328ad692c04557eb5c003eb4e
font_02_sfnt_off000152bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152BD 10716 bytes
SHA-256: bbec0bec05ce01bd56dbb9416414e65c95090c09875777dab97a415522f08101

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