Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d79a6c8234ddbb3…

MALICIOUS

PDF

81.1 KB Created: 2021-09-17 09:22:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1b9743bb654215f909f144a4828795b2 SHA-1: b99bb75efb46a75c0e5e78f8a88e1f867a666f71 SHA-256: 5d79a6c8234ddbb3644d620ad0aa1025411c0ce46d9ac865b33c3489d908410a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting it's designed to lure users to malicious sites. The presence of multiple external URIs and link farm heuristics reinforces this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pokewaveanaheim.com/uploads/files/55195396865.pdf In PDF document text
    • http://topbuild.net/content/xuploadimages/file/zobefanejovimorulukor.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/56724300276.pdfIn PDF document text
    • http://kp-technik.cz/ckfinder/userfiles/files/91473275741.pdfIn PDF document text
    • http://athaj2.specialty-match.com/upload/files/90296633086.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dfb755751e---xenukokoro.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/mojelutifovepe.pdfIn PDF document text
    • https://byocamacho.com/ckfinder/userfiles/files/72650400269.pdfIn PDF document text
    • http://chengzechem.com/upload/files/xazimozawikibapojafesot.pdfIn PDF document text
    • http://vit-physio.de/file/86660177357.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/1b68360590c3d15718733682bd4b8da4/fuwefomizijotewewere.pdfIn PDF document text
    • https://priscar.com/documents/files/13802345347.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/8ehgtfh6559b47cqrsdpsut9mm/96042177843.pdfIn PDF document text
    • http://huyndaicaudien.com/upload/files/wizukukaf.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/63987309190.pdfIn PDF document text
    • https://digireg.li/upload/45252888491.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/68323251825.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/pepij.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b756486e8---11624544221.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/fopisigokunivijitun.pdfIn PDF document text
    • http://czerwoneiczarne.pl/files/file/kerajozigi.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/96712051443.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/wogofiluwi.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/vifimositadezed.pdfIn PDF document text
    • https://mollis.rs/files/72365133637.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=latest+movies+2020+torrent+magnetPDF 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_off0000d46f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD46F 18968 bytes
SHA-256: 414fdcd4d0314f81824504eaecdd67f864ffabd8125e26395ca2b8b2db9b6552
font_01_sfnt_off000105c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C1 10672 bytes
SHA-256: 0f5f6f2c37488d2f73bb924b0baefa17f452b303b6f91cabb9c91e85f9d91367
font_02_sfnt_off00011e4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1