Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9112a4d0d0b8fd4…

MALICIOUS

PDF

93.5 KB Created: 2021-06-28 04:28:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e941a0d1fa42f51fa3d7fd53e1c70d90 SHA-1: a749889c1a24c803079275e564d20e9eb47fc343 SHA-256: c9112a4d0d0b8fd4a9ce861f91e6b192d9ab4114af0dc66eaa9db9ee0b5cae20
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS uploads, indicating it's designed to host or redirect to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution via these links. No scripts were extracted, so the primary attack vector appears to be the embedded link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://biothiennam.com/media/ftp/file/32342729824.pdf
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607b06dd75e64---minona.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a419a05b55a---42162488703.pdf
    • http://kurdumovldpr.ru/uploads/files/nizopemilavufodegej.pdf
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dbf4ed19c6---xexadig.pdf
    • http://a-kamen.com/userfiles/file/wazevisup.pdf
    • http://yjccnc.com/upload/files/93035646075.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/867bf32b644c6c7273f63b42839a28c5/vuvilovezipedisesuvuzegi.pdf
    • http://botosani.ro/img/uploads/file/97868298504.pdf
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/95067640899.pdf
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/8bbaa344ba164c1a5bcf0a38cc4c5ca8/69935819847.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/d06e1fea21b4b3febf79932c1075f220/vibiwemevoxegudikewe.pdf
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/564a5764d33b0035717070f6c3b3bd99/35741903205.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa62e4aa3c9---mapalomifenirexutar.pdf
    • https://energooptima.hu/upload/File/33911296909.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091bebb7bc7a---72630784483.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c95281dd287---59072020563.pdf
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/ua775cpl0gok0m4ft85cc26ho0/tukerenobapevodexeme.pdf
    • http://ixtvs.de/_upload_bilder/_filemanager/file/vekabariposav.pdf
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/ksejo2ct6cquq19ebs29q7bdc2/jogifirewubo.pdf
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/1661e503538883778afd5fdb3329670a/83863425549.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/69925f6991bab3083fcf37447a87d2a4/jazugiwekuxad.pdf
    • http://aklond.com/UploadFilesfile///2021043002150219.pdf
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834a8c8f68a---64535584837.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=famous+trumpet+instrumental+songs
    • 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_off00010910.bin
4b39c36054acc1753bd176339263b7f00d8b001b702bcfa526e42bc7a76373fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10910 17956 bytes
font_01_sfnt_off0001379e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1379E 16792 bytes
font_02_sfnt_off00014fb5.bin
6abab4e721a562d7048143929b6421d15b31cb4ffce433526299ebd2e1985635		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14FB5 10672 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.