Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7ec990dcde152ee…

MALICIOUS

PDF

82.1 KB Created: 2021-06-29 06:56:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 293d47525599b892ba05fd6ad569b09f SHA-1: 84ebef3ccac500547c306aef7a11607889eaf77b SHA-256: a7ec990dcde152ee5d2a41d29ef8a5d4508c81fce0814c152972e6ee3eb415b2
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The presence of external URIs and link farm heuristics strongly supports an attack pattern focused on redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://vet-arrighicolangelicristilli.eu/userfiles/files/dojisotojoka.pdf In PDF document text
    • https://festival.bg/fckeditorfiles/file/xevimux.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b1c7159ef26---90262392739.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/xenake.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/974824c8979cfc649c6a2c532baaff13/38878895994.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/2c16ca62dbb178331a76820b47d2532a/fuwovozuk.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/95912594269.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/8l12f57rse2jc8c63fteajfolm/46720741611.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16083bcca08a7d---zivifaresikizokela.pdfIn PDF document text
    • http://saptpadi.com/files/file/lobuvixafo.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/ub8aftq1hreg2qc5vtqmbbtlt3/58051319642.pdfIn PDF document text
    • https://taxiporec.top/wp-content/plugins/super-forms/uploads/php/files/hom2hbu5j9hki9seu5u1f34p9a/zuluvazopabiweridewepopu.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8da8c353a6---30047363451.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b86227b54---bivokapumor.pdfIn PDF document text
    • http://phpirateboosters.com/clients/867602/File/85981241726.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/5s3qp4260eiieujogae1fc02cg/12839907285.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160816771f0766---sejalefod.pdfIn PDF document text
    • https://nepalimodelagency.com/userfiles/file/69302449332.pdfIn PDF document text
    • http://apricomm.com/userData/board/file/risewuxupo.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e6979882d---pupolunusarokivuge.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/80823826312.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/8238cbdc481370aabcfcc18c9945aef5/39891239188.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1418e9b388---wupijefivokukuxideb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=blitzer+algebra+and+trigonometry+5th+edition+answersPDF 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_off0000dce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F3 16696 bytes
SHA-256: 8133b0aa7c078dcbfe88c93876eeaf18594f1ceb569747778063e6b242f2797c
font_02_sfnt_off00012083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12083 11280 bytes
SHA-256: 480137dcbda0a6993cd0e80b3985050d5d434aa2d45530b7fd2a784d1fc30ffa

Open this report in the interactive analyzer, or submit your own file for analysis.