Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ec3117e903f56ec…

MALICIOUS

PDF

84.3 KB Created: 2021-07-09 04:06:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d7e745ff31bab63c154347730aaa660d SHA-1: 16d1e1c34db34be1d47b0414077452d321726339 SHA-256: 0ec3117e903f56ec68f1863ecfc67325fc5ace8a98f2c91388c802b8ec2409b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. Heuristics identified it as a link farm hosted on compromised WordPress sites, with numerous URLs pointing to disposable or potentially malicious domains. The document body was unreadable, but the overall structure and URL patterns suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609201a4a6107---pokazuwetipakotosorusewor.pdf In PDF document text
    • http://www.anjhimayath.com/upload/file/29807813356.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160938d665d2f2---62161426464.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/0f32067d91dffe498eb5d7ee10d5e366/lurer.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/bematisepodakarelote.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/u4ckn2hj2i0lmgjutn57lme2f2/18942337554.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/cacee2897e5a38a0e7ca93f75ffc16aa/18026147537.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/72883887912.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160afa78cc311c---kekofubogefusop.pdfIn PDF document text
    • https://chris-arnold.com/userfiles/file/fusovawexa.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8190693b3---pijazulonanifefikafudi.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/b06a110df4fbfe9de6a839d7b029eb5b/muvigozikovewasikadumuri.pdfIn PDF document text
    • http://daotaonhaccong.com/uploads/userfiles/file/korazagejolada.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/prm6g9i4s516ocd8d08he2uo81/pitufesalopa.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871d6287d9b---betenovedulom.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/0c0115ceb8c0b320b08b745a62fbb65e/kumerifi.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/68301230667.pdfIn PDF document text
    • http://dtcguild.org/clients/80367/File/beguwel.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/lipoj.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/9100ecda781a4870b321397a548c6525/64225177748.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/85274476063.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/31eefef5fde1279b8d5bde6de345128c/67637436968.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/q5pldg90p5la2rd70orptteb9m/dikaginuposevud.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/27168587378.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=list+of+english+verbs+in+all+tenses+pdfPDF 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_off0000e5cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CD 17252 bytes
SHA-256: 6420338061efd7ccfd64ce6da4f3f52f316f116e5f70a53441bcc54ed45444cd
font_01_sfnt_off000112ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B16 10940 bytes
SHA-256: ade153e870caeac360b637363391036f462783c5cced75e6b12f8ffcae9b68fa

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