Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d436bb36b7f3795…

MALICIOUS

PDF

80.2 KB Created: 2021-09-01 03:53:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3ac45430b8a1c7ebd683739c003de03b SHA-1: 1e90cc82f2e0981a7e898bc14fb5a62c7dbebb01 SHA-256: 6d436bb36b7f37959030b66dea713b2fb898506ed4bf3f7cbea31a103dd6bb5d
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous URLs pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded URLs are consistent with phishing or malware distribution tactics.

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 https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608068f32e9e7---13443126500.pdf In PDF document text
    • http://kaiyudachem.com/filespath/files/20210809020144.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/d2b860697b489f497b8955621b7b673c/xasotuxokimik.pdfIn PDF document text
    • http://spodne-pradlo-2bpoint.sk/UserFiles/File/50953738781.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/kixebi.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/vuxotelilubob.pdfIn PDF document text
    • https://lemonsport.sk/upload/file/29570693841.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0e0673bf4---2091341425.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac79c46029e---ledazuladetejejo.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/89349058166.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160974e5d31e99---mekowabodowawamegadikad.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/bizudevubiziminapojawo.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/78506527305236c6e9909608ab5a5afe/murepuluzal.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/lisepe.pdfIn PDF document text
    • https://kocarbonag.com/luutru/files/42849697010.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ab18ssgvmgr6touqgo3shgmn4q/tinofepakixilosufemove.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608508caa7626---98179200114.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/24000265680.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/7897489889.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/95518489370.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c055f6bea89---38063344170.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8214e58b3---nazizavevuga.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/kijabu.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ea496588c---tagado.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+pot+up+dahlia+tubersPDF 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_off0000d69d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69D 16864 bytes
SHA-256: 71e3d7ecbf70474e11194602b71dd9ef6ffc49b821e21f2bd35e4178c72c8df9
font_01_sfnt_off00010252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10252 10700 bytes
SHA-256: f857ba394d5757eea6da151f7a5c2742a54dd7204892332ba802085c35144de9
font_02_sfnt_off00011aca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ACA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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