Malicious PDF — malware analysis report

Static analysis result for SHA-256 496cd8d217e5ae7f…

MALICIOUS

PDF

99.4 KB Created: 2021-07-18 13:54:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3f0171c7320598924db6a632ed04d5c4 SHA-1: 6403a364675a70be2869f0e6e50b8878f67d5741 SHA-256: 496cd8d217e5ae7f7e5d53324186e48c9b760e3f7b8ea48aac7aca8273aff147
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous compromised WordPress upload directories and other disposable hosting sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and embedded URLs point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9839

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://barcelonamedicalcenter.com/files/galeria/files/63884964077.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/1f02f5de88be931c63ad2165d73a4859/bulunelapevosovifajek.pdf
    • https://asiarsolutions.com/userfiles/file/71272989193.pdf
    • https://argekaucuk.com/nbg/upload/files/48824522073.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/3a4272mvockn26c7v3f7teas5n/fawoliwoduvalopozebakiba.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874d5a932ed---65082385790.pdf
    • http://passaicvalleyclassof1957.com/clients/44362/File/69902256518.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/cfc61698c99649d384cd239bb8ef3223/wuvesowijimoz.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607941f80fcbd---22619024920.pdf
    • http://aktifbant.com/resimler/files/58763605180.pdf
    • http://ort168.com/upload//ckeditor/files/poxebivivulirerubo.pdf
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084fb525fa8c---lonen.pdf
    • http://kcde.kr/userfiles/file/jokitosegolefojem.pdf
    • http://dancedynamicsla.com/clients/38740/File/84215731611.pdf
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/nilimotudebivibig.pdf
    • https://prestinireedcorp.com/userfiles/files/daxuvegigeseda.pdf
    • http://ipublicity.cz/data/file/xobujumowakerik.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/841e2c8c83a971675867fd4e4b6d0b00/tiwufafigarepoba.pdf
    • http://www.victoriousintl.com/new/resource/files/41595648137.pdf
    • https://skyzoan.com/cake/beta/userfiles/file/61405425085.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160b27e0757363---30373153943.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d311b96647d---gobijirozes.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=heroes+stereo+hearts
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off000165a1.bin
3ccc4de376c5d53b1612ce93ca790194ff049f18530a355a2d962470521ec7e8
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x165A1 17724 bytes
font_00_sfnt_off0000e67f.bin
d675ac5ce258e4129a738443882984c099f8a8465a51c0fb2208e5c9cd2e388b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE67F 9956 bytes
font_01_sfnt_off0000fca2.bin
e7ac4fe69ad71362cc16f87fdd63b873d114319a25ad0c335140df14421c3747
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA2 10720 bytes
font_02_sfnt_off00011ec5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC5 16792 bytes
font_03_sfnt_off000136d7.bin
124190353847789b994c80488d1900b8a65f68030063bca6df9e3251dc64df6d
pdf-font-stream PDF embedded font (sfnt) at offset 0x136D7 17920 bytes