Malicious PDF — malware analysis report

Static analysis result for SHA-256 85cfe05c5bfec69b…

MALICIOUS

PDF

88.4 KB Created: 2021-06-26 00:29:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1547b63408b95a816a321cb7436e11ec SHA-1: 354be6dfeda0c22a335fb8620c5367be735341f1 SHA-256: 85cfe05c5bfec69bbc4f82b73a4bf1e45fa172daca3a3335083c286bb273757b
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised or disposable domains, indicative of a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://vrieshorst.nl/images/uploads/file/fulilew.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1607049ff2b761---nevumid.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a64c9434ecf---sutunupiguginaw.pdf
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/69514bfafe0d96192dfd961b9c34ced7/71222371331.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be3d62644a6---38973832167.pdf
    • https://delcinfo.ru/img/files/files/vesawinonifulosum.pdf
    • https://augsburger-dartliga.de/uploads/file/27376963587.pdf
    • http://emmanuelmissionarybaptist.com/clients/74938/File/lulasuneniwenim.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792bf185bdd---61399844284.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6c409aa7e---titatiteluwilopiziwem.pdf
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/7f5558kkaksk64vrn9io4eblkj/xomazipagafer.pdf
    • http://lohsclassof70.com/clients/3/31/31ca850ff086a58b81c8700e10a01852/File/83261503080.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a53d5299100---72654140520.pdf
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b792591515---64774721343.pdf
    • https://footballsod.com/images/ck-uploads/files/45499493268.pdf
    • http://peneleos.pl/userfiles/file/fodasa.pdf
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b82b751d4---vemazoroposekudiwi.pdf
    • http://zeguvietnam.com/uploads/ckfinder/files/40524554576.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c87c72d8810---80714560811.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/cb20ba31b74ba25e7d2f79445416fcc7/rebekozodexaboziwudawusu.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7146d20998---derofuvisamebinafu.pdf
    • http://canxetaidientu.com/images/file/42694429818.pdf
    • http://lamdecal.com/Images_upload/files/82158901090.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/2df21a89e5658913d0fed99ca00baeaa/dazidanisemowesalid.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=ganga+river+map+in+west+bengal
    • 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_off0000f326.bin
7c3523b9d5edfccc3726447a97a1bdc89b3acf2aa08215139d4e67ec09b3985a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF326 18388 bytes
font_01_sfnt_off00012237.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12237 16792 bytes
font_02_sfnt_off00013a4e.bin
b9380e7e464dc34a9b62e08dca5172221159bdcaa5a4c914b988aa2c6160ced2
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A4E 10804 bytes