Malicious PDF — malware analysis report

Static analysis result for SHA-256 219deecbae9ad03d…

MALICIOUS

PDF

81.3 KB Created: 2021-09-19 13:18:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9b4a7200bc96d80ea2f1dd2e230e7593 SHA-1: d854daec91e2de5f36015c57ddc7a8ff810d90ea SHA-256: 219deecbae9ad03df1296c28bd03e4b99d90bc160edc106156fe68c6eda6338c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and link farm heuristics points towards an attempt to exploit users by directing them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://irlanc.ru/uplcv?utm_term=dj+app+spotify+android PDF link annotation
    • http://abwingsbuffalo.com/uploads/files/dabifomu.pdfIn PDF document text
    • http://myagreement.com/UserFiles/file/gorijavumevutebu.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614673ea844a0---basexodakodavasevu.pdfIn PDF document text
    • http://greenhere.cn/upload/ckimg/files/202109181756266151.pdfIn PDF document text
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/85559691926.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/80874288982.pdfIn PDF document text
    • http://skupka54.ru/upload/m/79670714160.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/vudowavetezube.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/2163051639.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16139c640d9cb0---66393263787.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/jomovogimubep.pdfIn PDF document text
    • http://popmetre.com/news/files/81268638166.pdfIn PDF document text
    • http://avvocatogiuliani.it/userfiles/files/velugunusek.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/suvofotibu.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/90718775201.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613620169e0a7---16420438145.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/95811489484.pdfIn PDF document text
    • http://xingyeknitting.com/userfiles/files/22994887378.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/39932572950.pdfIn PDF document text
    • http://dralituncer.com/userfiles/file/wavolur.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613cadb79e02f---87933778421.pdfIn PDF document text
    • https://premiersuli.hu/files/files/20935010119.pdfIn PDF document text
    • http://www.bsa.by/ckfinder/userfiles/files/nosumalibivepagenudupamuz.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_off0000d9d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D0 17800 bytes
SHA-256: ffbeb79ba7aabd179aa87a78423dac9c63c9be542ce6df63265b8d5c2116f0fb
font_01_sfnt_off000107af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC6 10556 bytes
SHA-256: 95de15728dba82bf0373fa072fb5d6f7960a7a4ea5cc07eceabed2fd20423246