Malicious PDF — malware analysis report

Static analysis result for SHA-256 553748e252b80ba0…

MALICIOUS

PDF

85.8 KB Created: 2021-07-01 14:46:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f6370cffc1f82d6e5788802b6b6f42ed SHA-1: c867458ce930f27a28e134b2c469b51b8c8079fa SHA-256: 553748e252b80ba0f1d6782e496cb68f576c70a785092610f7998dac8665bf7c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many pointing to compromised WordPress sites hosting other PDFs. This behavior is indicative of a link farm designed to distribute malicious content or lead users to phishing sites. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/vmd1o63olc63jhejdtgcfvai14/30805733660.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160841106ac839---14681953959.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607753f44915c---wexapumapabudowebuwujilud.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abde13738e4---58775919028.pdf
    • http://pijntherapie.be/uploads/files/jebodabujisina.pdf
    • http://happysmilecard.com/uploads/files/linemoxab.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a367adf0c4---51959695629.pdf
    • https://foundryindia.org/userfiles/file/84805960986.pdf
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdc6437163---38240456979.pdf
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/kibudavavi.pdf
    • https://wildarium.com/ckfinder/userfiles/files/xevurifunuzarakinajog.pdf
    • http://3e-machinery.ru/app/webroot/filesfiles/gulitogezox.pdf
    • http://ingenermarket.ru/userfiles/witukonubiwegu.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/04e47ff71b6b683a5e46df8307344a48/19358729360.pdf
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/acc03eb032c7c719a6a8e02ce8292b2a/sofakejabakikileka.pdf
    • https://musikkursus.dk/userfiles/file/74603265391.pdf
    • http://www.irrv.org/uploads/files/98951551414.pdf
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/kf82gt4hu5viqeno9rs10mnbdb/81105629479.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d2953a54711---lijuvabojoribokuliwozunit.pdf
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/f49757f377a0579171c3d87efa957fcd/vumowuwiziv.pdf
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6906e42ae---95465592588.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/n1qa98oruggebei5qot830mjds/bupirubemoporegelisasufed.pdf
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/cc2pa2glvgagaeh3bfgtkkqna2/rovomuposinalomu.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe7e042672---16904736263.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=ccleaner+free+download+full+version+with+crack
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb41.bin
60a2f7a7476dc617726ede767d742d6dde8c1b865e86533413ec9fa87a384fbf
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB41 10948 bytes
font_01_sfnt_off000104a7.bin
3b47e6e61eeb7640f018e9806a898b6075c01c859bf390015fb8e2308f63ec88
pdf-font-stream PDF embedded font (sfnt) at offset 0x104A7 17224 bytes
font_02_sfnt_off0001318d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1318D 16792 bytes