Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d928f49ff5def1b…

MALICIOUS

PDF

89.4 KB Created: 2021-07-30 00:41:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 659f199b743a5e42b3526b61d258383e SHA-1: 60887d3d16d7d2288a631e4bb6211cc70d6f5264 SHA-256: 2d928f49ff5def1b5588f5c029fd97b40e00931fed3c6012915c2fb0cbed7c03
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is part of a phishing or malware distribution campaign, likely using spearphishing as an initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://philabc.ru/uplcv?utm_term=passive+to+active+voice+exercises+for+class+7 PDF link annotation
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/ff32ef8532c65e978a0a91f4d1a5fb49/gebazukejifumuwutizumuv.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/xixesuwewa.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160fe385fa2b54---bejufekulojakex.pdfIn PDF document text
    • http://studiomanzetti.it/userfiles/files/8704615503.pdfIn PDF document text
    • https://rinducm1.com/contents//files/69940665919.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/558433393.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/64949401282.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d7319aaaa---76403994449.pdfIn PDF document text
    • https://nhakhoaanphuoc.vn/uploads/files/35357293425.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078bc0153b1f---43630082043.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e569b50c33---30491345994.pdfIn PDF document text
    • http://deryalvincotokurtarma.com/userfiles/file/soverox.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/gimupuk.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/68433833230.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2844d170eb0521e2a8ef967427121fac/fovibutunipanet.pdfIn PDF document text
    • https://performanshost.com/calisma2/files/uploads/19036334719.pdfIn PDF document text
    • http://lucidareemantenerepavimentifaidate.it/userfiles/files/76224672884.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/aqdt3uo9hqk60i7eum6h7q5vve/56750028192.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/28927735254.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b893674cb5c---62692062715.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/zejexunolum.pdfIn PDF document text
    • http://www.dismaplant.com/ckfinder/userfiles/files/sexipojab.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607af6e3090b8---sibafokomufotaja.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_off0000f846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF846 17212 bytes
SHA-256: ac2dd293c297d177ffafb356b0ff4ab706110f71018d934410489aba797ccb1e
font_01_sfnt_off000124b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B7 10444 bytes
SHA-256: 20bf2283892fb8153e4a1216b6ffedfb6eb203504405900ec0a531120f5399f8
font_02_sfnt_off00013cb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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