Malicious PDF — malware analysis report

Static analysis result for SHA-256 f69ad18931b12e4a…

MALICIOUS

PDF

79.4 KB Created: 2021-06-28 02:36:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 59113a7429944d0d14f71c965677098e SHA-1: 3fe1a2dfb8258bb5d6af4c782d5d270561f892a1 SHA-256: f69ad18931b12e4a2fd7bee7f531cdaf525256e1451f561c0f850681f09cdc18
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress upload directories and other disposable hosting, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://cgl.lu/userfiles/files/jenonefu.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077542913455---40095245396.pdf
    • http://magendans.com/imagefiles/file/9747134123.pdf
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/a7d27d1a1cb519b0c3e3be3b71f74370/kezekipetitotavipenu.pdf
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/0c0cb5b369fa28c1dce0751387da2db2/45148405553.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/b6f8ed39901847d0baeb925b0c09a5ee/51065332754.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/0d148cddbff57f5e807a36d11083f623/vuxado.pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/188b7c2c73a8c7c8fc77a214f3ee48a5/toburipagasolebo.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/b686e53cde36fc7450cac5358f14a6a8/53007107983.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160890f353eed3---88292260895.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8db6c0773e---20983017364.pdf
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/egviagq632ljnrutpul9bkonn7/difanimamijubini.pdf
    • http://abnicum.com/files/file/mowimuwijasebesowewi.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/1i3b7pesditpkd6j0gsvsdea5h/fomafubemijazavozujozuwar.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609015b9d13ef---mulujodaxobaxedutegoseso.pdf
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/8906a28c688459fcacba70bb2ba40257/fupokasupozelade.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609aaf1355037---busoralaxaxojimusesub.pdf
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/92403016629.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c77b5e2a00---98723285474.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a33e8718a---judebabazeneminuvor.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/d6i3j7qgg7bmls160rtd92suns/tepipusujuvebebezovob.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d798abaab5e---mofagipag.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b63583a1c0---79898713524.pdf
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4cd55e0e2---dojuzurowosow.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+many+valence+electrons+are+in+each+atom+potassium+carbon+magnesium+oxygen
    • 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_off0000d22b.bin
a206c5399598c2d27ce25e8d78e9efbca1d522d739baf758346335c696d6595e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD22B 11420 bytes
font_01_sfnt_off0000ecbd.bin
666280eb4bde251944ecf682de92602ffd191c99790301b848d912b0f2ca65ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECBD 16388 bytes
font_02_sfnt_off00011746.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11746 16792 bytes

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