Malicious PDF — malware analysis report

Static analysis result for SHA-256 338290122127e90b…

MALICIOUS

PDF

78.9 KB Created: 2021-09-13 01:51:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 929dda9da07905849ac5af2093d2876a SHA-1: 8e33514e1566914072118155bbd613c3649e9880 SHA-256: 338290122127e90be8a14a29bb375b5a5d7d40ce2e8b2f71450900ed493ded56
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to various websites, including those hosted on compromised WordPress installations. The presence of 'utm_term' parameters in some URLs suggests an attempt to track user engagement, common in phishing or spam campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://braveathlete.net/geektic/files/74225013992.pdf In PDF document text
    • http://naim.naparts.com/images/fck/file/12250370716.pdfIn PDF document text
    • http://trubaopt.ru/content/file/45197510485.pdfIn PDF document text
    • http://tuivaivietnam.com/uploads/files/monujodasewurekodinasufap.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0a8949319---fuvuwadal.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/9463738860.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/20819961216.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/40057584336.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/zuwawozij.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/50130640004.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/pg40ltiemcal5j9fji64ggr8ee/vedusibejutofapixeripuvax.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/12288692704.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/51036815418.pdfIn PDF document text
    • http://archiw.gbpopatowiec.pl/img/upload/files/wezal.pdfIn PDF document text
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/15467054729.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/gokoviwijesotopej.pdfIn PDF document text
    • https://ambalatender.com/upload/files/guxigexubugemetebewaguva.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/zujiwozubeso.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/59249670100.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16135192a9a106---lizijib.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/xatewijip.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/93228585226.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/zevijotovu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=animeultima+download+apkPDF 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_off0000d035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD035 10544 bytes
SHA-256: 23ac8f48d25c504a4d8575c0f489feeff0ecc420c9042d2615946363224fb864
font_01_sfnt_off0000e842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE842 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10054 17920 bytes
SHA-256: 3db695630bffe442270853d2929c86cf74720bd03d793ade962a6112a87db124