Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f55b302c0f54647…

MALICIOUS

PDF

89.2 KB Created: 2021-06-25 20:53:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6adcd10b9ea53b3e30d2326265ab92f5 SHA-1: 534a8d844a8615655fa5372d8741a093e4ddeb36 SHA-256: 5f55b302c0f5464727ffe321f75f8108c5be382ddb280ee0b2872f93ce2e431f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised WordPress sites. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The document's structure suggests it is designed to lure users into clicking links that lead to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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/160825f6bedf54---xajizesojuroroxaf.pdf In PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/78986207694.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/b26bb1578a02f4fd68cc5a37e2e9ff41/19413379354.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/31111469770.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160710f8d8b84a---melifabala.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160828cb4709fe---getudimubizetigagop.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae93b04e762---76316966968.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/f4613005f5e76ecdedc4ab1a1adaef81/83486959714.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/pozodupiwilujuxus.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/3073483594.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3d6f53bb6---98464581328.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/8941b807690cc72840ce11d693bf16e0/sevigamowatokemazer.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/933ef3f7b7b3189e0f91c5f288636221/91150905605.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/d46ec6f1b85a6432fd4ba7a730c85818/42727342645.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/10663500027.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c30533b10---98485326393.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/09e4499fdc8aed663d2098d18a18b145/27447978385.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/5b3047b966e8691c53148180aace1be2/zilunenemuvuvuv.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/lafabobenaxikodavoluwilip.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/82fe2de143ffb42be3e025984f439c41/72207446085.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/odaikq9s88r5kmq0l64vk1hqq4/mevuveluwo.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16098f62761ce8---wisuloduginumawejep.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070265bcc542---ridotutipakifobifi.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/25799805491.pdfIn PDF document text
    • http://www.moyekolodin.com/files/tinefoluwikagiri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=low+neutrophils+and+white+blood+cellsPDF 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_off0000fbe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE8 16560 bytes
SHA-256: 98cbbf5b0ec0d902898d07a8fb5feeabc7335a1ab0958c891a2332f95c4fcafb
font_01_sfnt_off00012673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12673 10892 bytes
SHA-256: 4bf4f73a536ffc1af68314273af16eb0020a68deee85ec9711df73620a731333
font_02_sfnt_off00013f67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1