Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8aa4b3ffa16818b…

MALICIOUS

PDF

87.1 KB Created: 2021-07-01 22:47:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0dafeb3bb150e59dcfb4cd843a2328e9 SHA-1: 4a54e52d9b663e9815acf377fcd3be527aaf6364 SHA-256: a8aa4b3ffa16818b4fcee354fde58300d04baca17b3a5c7d6cf0959cb3ae45c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. While no scripts were directly extracted, the nature of the links and the detection names imply a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/8affa6896d5baefb6c17bc3ecce2b5d4/vufidef.pdf In PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c1453a3913a---letaxudutomorolel.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609509fa7bb01---29946114815.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/41f3b58eaaa3d3762986519eca48c6c5/bikomefajijamotepokodo.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/86294596838.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/b7c9af7a1ff0698df73b14c102b43f1b/subuwibifujazig.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae7dfd39ac---zavoxew.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/106b7a61a5c997931655c42f724b067b/75826835171.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609bdf9656bf7---zabepuxaginir.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075bc542cafc---tisojujoxavosebovivopo.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/5cc5176a2a58de4825b322d4f33aaffa/37864960571.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/kerirofaw.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/zokaj.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/7ik6eiicata43985n0m8e6mot7/74267090948.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/db4c1b5659c3831878600e40071b57b2/58117136462.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9f9258724---51706644795.pdfIn PDF document text
    • https://cncunse.com/d/files/25191702604.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3aea1e55c2---64578030848.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/54883752460.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/podewili.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092742e59c10---nusisetimi.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ee2475dde---bupokigalomovaf.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/difevagofuzovexinupu.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/b5b410be545fb393c7f30c3eafcd512b/3009043072.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=my+baby+is+wheezing+and+coughingPDF 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_off0000f2cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CD 10900 bytes
SHA-256: c5e108e3f55674398519913ba91ebbdd471b606d78b2a3bfba4a98063f08e3bf
font_01_sfnt_off00010be3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE3 16676 bytes
SHA-256: ea1af88104319b8232fcd3df05cf821d3dd1ff519383d6810c066123f4ab77b3
font_02_sfnt_off0001371f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1371F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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