Malicious PDF — malware analysis report

Static analysis result for SHA-256 e19404dc5ec31d43…

MALICIOUS

PDF

72.8 KB Created: 2021-09-11 06:53:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b35eebb142e3bd7228c7f3d937ca8d17 SHA-1: ddadcdb31bb847612926fe2dfd3d2613e0575cd4 SHA-256: e19404dc5ec31d43914928b42555450d51b97403e8ca9c177b830c2bed8bf90c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which are hosted on compromised WordPress sites 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. No scripts were extracted, but the heuristic findings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://smidgel.ru/uplcv?utm_term=how+do+i+zoom+in+on+my+android+camera PDF link annotation
    • http://topstec.com/d/files/3909479957.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/90326202794.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/lavepulujaketofuk.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613aec849952b---7870158035.pdfIn PDF document text
    • http://yetisirkaucuk.com/firma/files/58839991776.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/fotagi.pdfIn PDF document text
    • http://pro-roubenky.cz/UserFiles/File/36389167884.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/214b1058ff9d7d2d39ce37643f3231f2/vetufusaleliladosimubuse.pdfIn PDF document text
    • https://warungmimpishio.com/contents/files/sukurepemezawox.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/mofubo.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/lolirule.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/68943420418.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/kabixifubow.pdfIn PDF document text
    • https://birudongker.com/contents/files/74811017542.pdfIn PDF document text
    • http://rapet.hu/files/givalulujil.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135d9c6611b1---92262246689.pdfIn PDF document text
    • https://bocrangsuthammy.vn/upload/files/67374719752.pdfIn PDF document text
    • https://go2germany.ru/files/file/poxosezejala.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/71281485831.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/11937108447.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/rilugarisojizefazilarat.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf71b742e9---87464472765.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/42578737152.pdfIn PDF document text
    • http://toroisg.com/public/images/files/56120922488.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/jizomajitejiwudafuda.pdfIn PDF document text
    • https://gcr.goldcrownresort.com/magazine_files/files/nimezapawamobix.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_off0000bc09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC09 10468 bytes
SHA-256: e4dda620204d27cbc9a98db830f1b0eee98f735275cf9654f61164f07d8f86bc
font_01_sfnt_off0000d3d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ebe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE3 16060 bytes
SHA-256: 628a4b3458b89f9b642e54a128fe745a56c2b77bc4d630291f5582f509c1df66