Malicious PDF — malware analysis report

Static analysis result for SHA-256 dda28449bdf94e8c…

MALICIOUS

PDF

101.5 KB Created: 2021-07-27 02:47:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 25aafa27a44229fc9fdca8c43b10f6a1 SHA-1: c11a024aeecf4a162eb3bafe06f80400ec8328e4 SHA-256: dda28449bdf94e8c37e2bf6150b5a303d8ceb664bac3921eb2302bb001f4085d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to multiple compromised WordPress sites and disposable hosting, suggesting an attempt to distribute further malicious content. The presence of embedded URLs and the 'Download Button' heuristic further support a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ei-windykacja.pl/upload/file/1876696265.pdf In PDF document text
    • http://kcde.kr/userfiles/file/fusufufiziwa.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/zaxakem.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1606d263972701---91077508773.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/zasasu.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/d0l73qirdms4lubda9nircertp/64526505364.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160808176ccc82---nelabimiwitafal.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/pojesu.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/6da42ca31c6ba78b98cee1f6d99d48bb/70503053119.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/kiture.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609412f5002a7---wiboxez.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f117f19244---65648676886.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160715bc1cfaf6---66515661350.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/46036759821.pdfIn PDF document text
    • http://deltools.com/userfiles/file/mikomujonuvegidiwuvugitom.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/056e0070e5db288aefd493cb74cb0876/zibejoxuzegu.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/fvafams65244i5u5qdvjqpbg0k/gujonavasawugubi.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/47c4eebdeff9c611e7b60dab9d8ea974/35193063525.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/nulaxojakomakajade.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/15bcb0b10a75e4387d3ff0b6452afe90/45069496700.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16091067a318e5---36135878073.pdfIn PDF document text
    • http://xsteelstock.com/d/files/lofov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=spider+man+ps4+android+no+verificationPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010dec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DEC 18324 bytes
SHA-256: 460b88fd4554c6ba86e7a57137abf3570779bc2efdda7b0390a91cf1d2ac0148
font_01_sfnt_off00013e4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E4E 10956 bytes
SHA-256: f65c5f536faa624f815cc5589d08f920b8bebb8ac115d4c786570006ebc43e5a
font_02_sfnt_off000157bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157BD 16544 bytes
SHA-256: 66b7945b99a9c78025a9a0ace4161995b24b08b80ea391fd428eddc3553bac27
font_03_sfnt_off00016e80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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