Malicious PDF — malware analysis report

Static analysis result for SHA-256 d697879aba3bb3e3…

MALICIOUS

PDF

79.3 KB Created: 2021-09-21 06:11:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e4f589f715a1cc49f36ec5019479bdc5 SHA-1: efec7b51f01b4af201db7f2382e4c18f6a09fa50 SHA-256: d697879aba3bb3e3192ffb41e22ab398032e191b92e3a25e11f265b1d911df29
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs and is flagged as a link farm, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a trojan. The presence of download button lures and callback lures further supports a social engineering attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 https://drafthe.ru/uplcv?utm_term=hosanna+kirk+franklin+lyrics PDF link annotation
    • http://atek-ent.com/upload/file/bedekiwukobupefodageteva.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/werubiwuguposejedet.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0c4bc1de2---11411131095.pdfIn PDF document text
    • http://lycee-elm.info/userfiles/file/71035444035.pdfIn PDF document text
    • https://alkirbilaw.com/userfiles/files/foxikixexureke.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/23255204488.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/63089521397.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/wibaf.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/79624553527.pdfIn PDF document text
    • http://ketphatthinh.vn/upload/files/49148500770.pdfIn PDF document text
    • http://haphadoor.com/upload/files/movisukebemewa.pdfIn PDF document text
    • http://playonathletics.com/userfiles/file/77547968680.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109190443232997.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/xosugetugizilolo.pdfIn PDF document text
    • https://ikorti-iao.com/userfiles/files/54162755730.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/7588ad9ab1c77243e1963fb93bb75e96/18001544009.pdfIn PDF document text
    • http://minhnguyenvn.com/uploads/userfiles/file/3770971596.pdfIn PDF document text
    • http://yuanjiangchem.com/upload/files/90766016306.pdfIn PDF document text
    • http://quangcongluc.com/upload/files/jejoxujeje.pdfIn PDF document text
    • http://terezszilvia.com/images/uploaded/file/24658830802.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/78253751669.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/be31328fe261cf919e48fc0506f49497/fedupamovupegikozigib.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/78247111562.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/52259213486.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_off0000d232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD232 17868 bytes
SHA-256: 640543825ffde67167e121b1922416a706675f17a480fffefff21223fb5700b0
font_01_sfnt_off0001003a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11851 10296 bytes
SHA-256: 5281e4908bd6f1eb0883b859259bca2e81246ff09a4d55a7e0d745fb2cf3e7b3

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