Malicious PDF — malware analysis report

Static analysis result for SHA-256 13f0a93cecdc804c…

MALICIOUS

PDF

80.9 KB Created: 2021-08-21 10:13:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6480ce19bf6e64e326f2cd1d5dd445f2 SHA-1: a6dbe44539ae6d03951395b90fa4f275c33d9c10 SHA-256: 13f0a93cecdc804c8d38aafa443f177e964272539828b7a303075bd259401e1f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The document contains numerous embedded links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://catamma.ru/uplcv?utm_term=ez+looper+instructions+pdf
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b17221627b7---51349716106.pdf
    • https://ancoraeducacion.com/images/72430500952.pdf
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/9mbt0dmesldueuteur5itdraq0/kezopifasisonofuvaxawoxiv.pdf
    • http://myphamlulanjina.com/upload/files/xekafarejetunidivul.pdf
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/gimuno.pdf
    • http://brno-skoleniridicu.cz/ckfinder/userfiles/files/81601541082.pdf
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/4d80279adf83bba6132116222cd27ebc/tebeviwofodefodidifaf.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1607f57a8e48be---3411418513.pdf
    • http://verynailscm.com/user_img/file/43672856529.pdf
    • http://vdavloeren.be/userfiles/files/9072268182.pdf
    • http://zoltysnieg.pl/pliki_wyswig/files/kanabimazapanaturavesaj.pdf
    • http://c2ctrading.org/cms_upload/files/judirafu.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c33542590---sinuweboz.pdf
    • http://dansensvenner.dk/imagesfile///17639264250.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/0s550duj6bpig58735jnevjui7/fegof.pdf
    • http://iccj.jp/images/uploads/fckeditor/file/liberederowurerowesiw.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e333485e022---62407759570.pdf
    • http://zussobrance.sk/grafika/dokumenty/41720549930.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b31c1f88382---rabanovifube.pdf
    • https://mimpishio1bet.net/contents//files/giwatutow.pdf
    • https://notrepanierbio.ch/userfiles/file/solegapogubo.pdf
    • http://adveotec.com/img/file/gubawiwapaziwosebeteg.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc433b07eb---nilaxile.pdf
    • https://actor-conseil.com/files/file/disisugiru.pdf
    • 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_off0000db82.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB82 16792 bytes
font_01_sfnt_off0000f399.bin
335b45b9d7ff3ad60c2158798f52fd31140e8de3382d1ac57a8165b63c031eb1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF399 10592 bytes
font_02_sfnt_off00010be6.bin
ae37c05d0edc374f5de09699706aa6d62addd2150aecd1f5f4d0250f960e4296
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE6 16096 bytes