Malicious PDF — malware analysis report

Static analysis result for SHA-256 a00c8db9fbaa4ece…

MALICIOUS

PDF

82.6 KB Created: 2021-09-21 16:47:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4bf22d01e1117272740b142d292466ec SHA-1: 31019cfbdc64c1b6d3392b3178b5ce06617a14ea SHA-256: a00c8db9fbaa4ece2da0ad2c1c69f385c3b0c8ffb806808fb7708815fa1a7797
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to host malicious content or redirect users to phishing sites. The document body is unreadable, but the heuristics strongly indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8b2d6d068---28005937341.pdf In PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/211d6f78632929334b5d4c0084e4baa7/goxesevaxifipojejapivinar.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/vinozitepenatoj.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614809fd290fe---remumodixasawale.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161433e15d59ce---1647052336.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/efr699qkqa09rbgg02e2i62ufj/78678500931.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c140eb4d8---77413886818.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/xelonegakinizasimirez.pdfIn PDF document text
    • http://etnorom.hu/pictures/20705528564.pdfIn PDF document text
    • http://koreabulk.net/userData/board/file/89019469881.pdfIn PDF document text
    • http://vecsecity.info/editor_up/jojuzevexiwivu.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/19cd731e5f2a0fd513b6d42ce02f1875/54977006681.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/nonedilodefoduge.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/80162342357.pdfIn PDF document text
    • https://endeligmandag.no/e-brev/data/div/62074340473.pdfIn PDF document text
    • https://duocvinhkim.com/userfiles/file/patatikut.pdfIn PDF document text
    • http://goldenagegroup.vip/userfiles/file/49626386795.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/63099591107.pdfIn PDF document text
    • http://25630638.kad.tw/kads/ckfinder/userfiles/files/xuloxox.pdfIn PDF document text
    • http://master-vin.ru/files/file/82685649081.pdfIn PDF document text
    • https://www.paseppe.gr/ckfinder/userfiles/files/81059138139.pdfIn PDF document text
    • http://newo.ru/files/files/33552317886.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/47796583230.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/lizanapegelugifozire.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/pabezovopixagufabepeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=boltss+map+meaningPDF 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_off0000ddc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC7 10548 bytes
SHA-256: a98c5cdf02290fb6e2841ec4faa3f50264e5987650ee0c7cb6d56150f7fd835a
font_01_sfnt_off0000f5d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D4 18096 bytes
SHA-256: ca5113712acc3a4a5ec03416c30929ebdf2740d5fb41d7c72370f37c84c7f50d
font_02_sfnt_off000124df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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