Malicious PDF — malware analysis report

Static analysis result for SHA-256 720f79a328423abc…

MALICIOUS

PDF

85.4 KB Created: 2021-07-19 05:46:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b27d732e64554dd1db1f4471c1ea8b70 SHA-1: 3fd353215f55dbf8dbc9b556c2a107b939ec6fd0 SHA-256: 720f79a328423abc7fbcfd9d62a5ebfbddeb77ca60c4ca59526d88629d7d56e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, directing users to multiple external URLs hosted on compromised or disposable domains. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://enslev-anlaegsservice.dk/userfiles/file/8093660453.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16089f414940bb---92789712976.pdf
    • https://xn--pssa17sw71b.tw/upimages/files/gepixuzaroka.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/54qivq7h0fnmt18jrfdqa948q2/79687649344.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b1832fd8e06---21731347395.pdf
    • http://mvhs1964.com/clients/2/20/2030ff4f331b14c2016b95997514b7ac/File/rolulotizamokisadov.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e248333bd---86345224955.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf6ad5dcf9---lufovizukesitim.pdf
    • http://aceonlinementors.com/userfiles/file/tudafasaweriw.pdf
    • http://allycatering.com/userfiles/fujubirumoku.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d1dfee46ed8---modebunazu.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608be0bcb437b---2623004669.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160959d3c0a2d4---duputazi.pdf
    • http://portaldo.eu/contenuti/upload/file/63954795370.pdf
    • https://asthasupermarket.com/userfiles/file/powuvefifoxe.pdf
    • http://tai-yang.tw/taiyang/upload/file/kuvomiwifozezafufotizuj.pdf
    • http://terezmisszio.eu/files/file/sedoduwozezekanalom.pdf
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160703fd42ba38---61741424884.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b77dc3935d---vabopilavu.pdf
    • http://www.allatpatikapecs.hu/images/file/fituwexoweterafopuvofama.pdf
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/b6b19ce173c1410b4ead5cb6ff44ec4b/64205702901.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc42c1033b5---golomulor.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=steering+wheel+vibrates+when+driving
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea10.bin
24eaae66805ca36482efd10d6527fd35f5e0e4e0ff2989602290f4d1b8b99a85
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA10 16956 bytes
font_01_sfnt_off0001160b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1160B 16792 bytes
font_02_sfnt_off00012e22.bin
703a0213b0411aba411251e91cf2443a060c38cb4061f8abacbb9f4df697c9aa
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E22 10772 bytes