Malicious PDF — malware analysis report

Static analysis result for SHA-256 883d837ab1408597…

MALICIOUS

PDF

83.5 KB Created: 2021-09-02 11:12:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2351b1d3f7cae5ad9a0231b98989daa9 SHA-1: f3ba28b9871832d952cd5200b181a1caddbc14f6 SHA-256: 883d837ab14085970cda922a93f7f6e297279c88d7b87d4f8c8d2ee9ca3d8cae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised WordPress instances or disposable domains, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics indicate that the primary goal is to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://garglob.ru/uplcv?utm_term=exercice+masculin+f%C3%A9minin+cm1+pdf PDF link annotation
    • http://goang-hann.com/uploads/files/202108261815409907.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/tp4bm5q27chiejrqse7ckst14j/59004656756.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8c0a29621---42727964376.pdfIn PDF document text
    • http://santeh.md/img/files/jirajoxipupisovugi.pdfIn PDF document text
    • http://photonart.nl/phpcmsys/file/78994331616.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/5568915584.pdfIn PDF document text
    • http://siembra.me/uploads/files/suximegebobokeritevi.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/natifegamugenesigimoleba.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611ab5ac501cb---nalabunuvixamojim.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/zaduwukilonu.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/nazoluxosonoxugigivi.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/4f74348dcca827ce322c657afbae9ec3/29807077693.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1a0d87bb6---bigod.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/7d2316ffaeeef98c190d7eba70b1465d/bogefigolosukijowezimawi.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/867b04ad133c8d17c2598a560725142e/26250257186.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/kevabasulipulalaji.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/4eda167b99d8be6d9f6ac38376709c2c/tenasuger.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/udc4nbgfbrogqn24bpv42q2iit/duzikawegebada.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/nm2qaiq5eioggin74rbsa7fant/zifevosujaxojotoj.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608bcdb0eb7a8---41498705541.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/38284975900.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/e7pcf9ohe0i5e3nltb8mgsdksr/54710933569.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/78073870147.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_off0000db4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f35c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35C 19748 bytes
SHA-256: 0d31eb92d6f8c8e5ed5286bfc8e9dd3cbb24d0602ed238730dd6ee8fddcd97b2
font_02_sfnt_off000124c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C4 10952 bytes
SHA-256: bb59ad31aac0b71c6532d8741f7bf590456b4075ed60886e68fa5c3e1785b319

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