Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc0fe022b491cc3a…

MALICIOUS

PDF

92.5 KB Created: 2021-08-16 12:29:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4357031ec04960b21458445c958404bf SHA-1: d17d9ba7cb904ba8f8bc3b3fec1c0a2d230d516e SHA-256: bc0fe022b491cc3a0fede74fb5368bbf17c2d4f4b165259738057ec301058a46
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to compromised CMS upload storage and disposable hosting, indicating an attempt to redirect users to malicious content. The embedded URLs suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://allegypttours.net/userfiles/files/vepolajizupe.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a947796e9fe---kekemokumo.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16082ff01200b6---gabamom.pdf
    • http://chelseafoodmart.com/uploads/files/kapupixokore.pdf
    • http://originalcheck.it/public/img_admin/file///18671901846.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/f62d262324a897e9e26b1db017942d0d/mivupuwegivoleda.pdf
    • http://phillipsbrothersmill.com/clients/6/65/65192871cce8a6e36080a9ebd2808b02/File/tozewakojidurumuxulosikew.pdf
    • http://uniquecharacters.com/upload/files/79951377943.pdf
    • http://murielbellhomes.com/userfiles/files/52545806872.pdf
    • http://finproekt-msk.ru/userfiles/file/7163051602.pdf
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/8b0abfbe265308cf3b3d15858e8b5f82/walonebirurixerivalu.pdf
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5bc0883b93---60148409184.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2480d6426---64588318170.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1527782203---53682033864.pdf
    • https://olympicwroclaw.pl/zdjecia/fck/file/61187957780.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/jt138sru9opea1g952nap8f3j0/donujubaxewado.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3750077a2f---71437629063.pdf
    • http://alarcon-v.com/editor_upload_image/file/94559616489.pdf
    • http://ersatzmonitor.de/userfiles/file/27656546963.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9b3066f59---84402266229.pdf
    • http://childconnect.com/swi/fckfiles//file/44381948151.pdf
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/a540269284c5bcdcdcc12d15db4766af/didakek.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0259a94408---tunomufaba.pdf
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/vupomenavivaj.pdf
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d43676655---52141871196.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=hp+14-inch+celeron+review
    • 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_off000106e2.bin
af7d01a34ed45c1595930f07892edacd169ee3156319ae892f8bed3315b96f13
pdf-font-stream PDF embedded font (sfnt) at offset 0x106E2 17576 bytes
font_01_sfnt_off000134f5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x134F5 16792 bytes
font_02_sfnt_off00014d0c.bin
64f28d21cdac91dfe0c6ad3ef2cc4060e13000a921c6eb11bc95c2090b9e93ea
pdf-font-stream PDF embedded font (sfnt) at offset 0x14D0C 10348 bytes