Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3d89e74f9e7a7fb…

MALICIOUS

PDF

81.3 KB Created: 2021-09-09 13:17:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 83b707cf4883dc8e317df668e209e8c1 SHA-1: f412ee7c744c020a1c21ab7ec73376147d006aab SHA-256: a3d89e74f9e7a7fbcdef3462acaefc5ea258bdadd595d2d4a170b7635bb825e1
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to various URLs, some hosted on compromised WordPress sites. The PDF structure and embedded URLs suggest a phishing or scam attempt, likely aiming to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://allytemp.ru/uplcv?utm_term=redmi+a3+price+in+bangladesh+2021 PDF link annotation
    • https://specializzati.tecnaevolution.it/dataload/ckupload/dusamejemazutagojo.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/77330251249.pdfIn PDF document text
    • http://www.farmaciavictoriayjmleon.com/userfiles/files/96682072418.pdfIn PDF document text
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/rewatovopimizovaf.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/dosapinunujupeguxoto.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/79891196789.pdfIn PDF document text
    • http://www.agot.pl/upload/file/21604445516.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/0c08793e84b249f2614a12ffde4edb00/54324984102.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/89ab6243ad907f2bb11eb34b64e4795a/lekajerevu.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/sumazurug.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/14cb54d02ff826523f4174e373673b58/bosil.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/toseper.pdfIn PDF document text
    • https://cecprint.com/images/file/movolixokudijo.pdfIn PDF document text
    • https://sintasyapi.com/img/userfiles/file/rogaxawow.pdfIn PDF document text
    • http://fairway.cc/images/blog/file/28129149793.pdfIn PDF document text
    • https://braus.uz/images/shared/file/zisuveda.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/2162533092.pdfIn PDF document text
    • http://cegled.varosom.hu/userfiles/files/wikitiwitepetamew.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/pavekurewasurekepi.pdfIn PDF document text
    • https://saigonservices.vn/images/uploads/files/kaxepado.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/chut53ne98agjv1t6hegqnf1ai/pifuvibotizajomezisopox.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/zelomifamivovotata.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/ligoxabu.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_off0000d7a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB9 11392 bytes
SHA-256: 849630345e565a6bd1e73ae0c4439124aa6d20059986065662baff6040aa5c1e
font_02_sfnt_off000109f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F5 17360 bytes
SHA-256: 84c02534632d3e31eee74397623edc8cffa705f5ebf78c5f1943808fec50bf77