Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f885c4285f5b9c1…

MALICIOUS

PDF

86.1 KB Created: 2021-06-28 01:38:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 830633c430e5433c0e6b228a27d60ddc SHA-1: 7cc1e193244ca9702009d97966a403cfb5f1e8a8 SHA-256: 2f885c4285f5b9c1f43c5b01bc57368d453f0de902c2a6fbd4d211ff1555c4e1
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, so the primary attack vector appears to be the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c79a3929c5---fixasovomuzinosune.pdf
    • http://dinskayarealty.ru/media/file/83725409431.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/44bebdec0a86c5da0aa6107c73dd7d3e/29296065877.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607b12f83273a---bajebasafez.pdf
    • http://cioccolatogallucci.it/userfiles/file/gananilexerawaxopeli.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16087ad39dcc1c---rabojeguvogi.pdf
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/53402373931.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/rovpnpvrni5g6du5gpknd1ngg8/4149713383.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/b0873eac78103c6aece96e9ed2f2c682/kiwaxifelepira.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1235578fc---12255581361.pdf
    • http://historia-bfured.hu/userfiles/file/jukiroradojakirex.pdf
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/239b57e1df19762b8f003871d8212f5d/95660646547.pdf
    • http://yaeram.com/userData/board/file/tegapumesusojerubipifadav.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2f5172903---vafupepofapuxokewotatubu.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607340c7ab2ed---46030340763.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16077e7655bc80---67216091028.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4573d9533---15819189180.pdf
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/1a665b94b79530a86bf2d9ddafef763b/93077137190.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/628fa9bcf1e39abf8a51377741687447/rakusuloxabulo.pdf
    • http://topas.lt/userfiles/file/64451816730.pdf
    • http://dreamcatcherltd.com/userfiles/file/kaleguzezogufufetojipibe.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/cfcf7436353af76b47a7821b002c5bfc/kizalapovi.pdf
    • http://gibisch.org/files/files/gafojukumonajuneni.pdf
    • https://stopserv.ru/files/file/81301784219.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=merge+to+images+to+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_off0000efee.bin
4bcdb1f5b6e8e45f14e998804d21a17890d39d9f274c0914c44b2335939bfbe5
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEE 10684 bytes
font_01_sfnt_off00010844.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10844 16792 bytes
font_02_sfnt_off00012056.bin
fc46a03e54dbe320ef64a13c197b60a45da085f36d9416139d7b052a09bf2349
pdf-font-stream PDF embedded font (sfnt) at offset 0x12056 16520 bytes