Malicious PDF — malware analysis report

Static analysis result for SHA-256 990667f810e60ea9…

MALICIOUS

PDF

75.9 KB Created: 2021-06-29 11:42:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8e7dcb0dd5bcc7f1cdad85de9a778223 SHA-1: fd429421bb03e19bc51830b8ddd92d9ea6bf321b SHA-256: 990667f810e60ea9431573810fe5dbfebb2f4a0691fbca6fe1016736ebdd4c3a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a potential distribution point for malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these links. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/0f45095baf0cfa63a12519f1c39c140d/45042098968.pdf
    • https://szabobuszrendeles.hu/files/files/lafadoso.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e304884b4a---xewuxejujazutenol.pdf
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/50513146168.pdf
    • http://beergolfers.com/blog/images/file/vivipabo.pdf
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/6b81b0fec3993d5de161a6fa2eed4729/47075305065.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c5538302d---1997461930.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/cd11710ceaa63624df616107eb26efa7/minipinozukigijokebi.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f427db6f3---titiginulawekefewita.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae3f9af767---84376038551.pdf
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/itkl61qfgn1hbkc5b525if0js4/30354422785.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160baed71bba14---89602413409.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/ikg4hdd2oj079n6omkonqf4ju1/foxesolar.pdf
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/871357515609839dcec94d.pdf
    • https://ewdel.cz/ckfinder/userfiles/files/kunosikuzekililikip.pdf
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/b9a16bc9f5d3673dde12120d3d9b29be/44666320751.pdf
    • https://activepymes.com/pub/file/51755249918.pdf
    • http://okwmd.com/upload/fckeditor/file/lugikefu.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609761470f1cf---dejujapapuka.pdf
    • http://erpsamik.com/ckfinder/userfiles/files/73370402072.pdf
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/29g72eul270sh9hb8fhccnf4dh/kapobarupibosuvu.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b7af18b7f---93040235459.pdf
    • http://holzbau-napetschnig.at/27589764513.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c6747491ea5---24685453710.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16093b3935bed0---83999786867.pdf
    • http://synowka.pl/galeria/file/xisuzelegazawi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+convert+pdf+file+mb+to+kb
    • 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_off0000c711.bin
36181affe24396bd436d9150a99d627ed9762ba50f33b2015d831fd00f81e98e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC711 10824 bytes
font_01_sfnt_off0000dfc0.bin
463cc6030dd4f6300fe6de63fc8fd6909fa8a89316581182c0b11775ec1064cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC0 16432 bytes
font_02_sfnt_off000109ed.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109ED 16792 bytes

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