Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a6d793666880f16…

MALICIOUS

PDF

77.3 KB Created: 2021-09-06 11:35:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e1bc73438fa22cf26c2caf1b847bd3cb SHA-1: 4a5352da1e5332aa5724dc4df317f392a4be1850 SHA-256: 2a6d793666880f167bc57a14ea97f3f5519791f31a951879ae34015853a25015
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are hosted on compromised CMS platforms. The heuristic firings indicate this PDF is a link farm designed to redirect users to potentially malicious content. ClamAV detection as Pdf.Phishing.Trojan further supports its malicious nature, suggesting it's used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=classic+fine+food+catalogue+pdf PDF link annotation
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/dabfd787d5777938108aa603a026337f/18093555892.pdfIn PDF document text
    • https://actorconseil.com/files/file/12081517849.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075ea56e2465---78822138703.pdfIn PDF document text
    • http://indexone.ru/upload/file/vanataxelaniwesu.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/63391862412.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a8f278a9f---18801147290.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a36c629820d---kivadofurejupisap.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/1f5ca8795dba8f3cd35e177252b401af/zezuxodelud.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbf3ea6831---7017121574.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/1633e0d5e5627448d17cb39c4e5a7645/77574581278.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/37054137679.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/7a78ec2bc9f47c31881e4dbefa851f27/75292580308.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/19100227424.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/d1e8bf093226e80df56d5ac17ea789ad/34898499944.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/vajug.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/55100406774.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/e309d1735c961bef597ee559ecb96a1e/36423170899.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/9ed86bbc39f29c6cf6f9e3d22cefbc95/gokakodeko.pdfIn PDF document text
    • http://biomax.shop/filespath/files/20210826003852.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609b63803b595---86067083459.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/kisobalowafanukavifif.pdfIn PDF document text
    • http://copelandreunionla.com/clients/6/66/66f6f3de7053633686652f51c4c00696/File/dudekiz.pdfIn PDF document text
    • http://nhatnguyen.vn/media/ftp/file/24557831628.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_off0000cabd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCABD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D4 10824 bytes
SHA-256: f7cf743bd29c8e31621963c3892e4c1293d52d99db27300ab8fc254df35660de
font_02_sfnt_off0000fbb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB5 17484 bytes
SHA-256: b7f8de3fade59b39183450a460c2e591cc438daa31c038ca9fe9b9b7f46403cd

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