Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ea5165037f4f438…

MALICIOUS

PDF

100.2 KB Created: 2021-09-03 04:54:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 628ee7743a41507b4ccbf65bd8c81cfe SHA-1: 61dd87ebdb90c7172d7688623973d5b786094210 SHA-256: 6ea5165037f4f438cc80a01ce425dbe375968153585339c86cdec0eb43dbd434
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using these links for malicious purposes, likely phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://synerhu.ru/uplcv?utm_term=1000+de+erori+din+cultura+generala+pdf+download PDF link annotation
    • https://xosobacninh.vn/webroot/img/files/64941535521.pdfIn PDF document text
    • https://yuanfuconstruction.com/ckfinder/upload/files/59188841282.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/su8j6bftjljsuqsj70lkc5dc66/5151969450.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/doketapana.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/31240803082.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b1ef1d1c1---sebigepisixu.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/51789133110.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160b2268eeea41---89482354940.pdfIn PDF document text
    • http://vogiantinhmach.com/media/ftp/file/25856234817.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210705221448.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/nawutezelerajuxun.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/vivimasemojenozubujuzosa.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/7d5ca0d56d1063444b59b8f25c465686/karedofax.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/0ca4eb72e4b08370576c206feacd6449/23010484351.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/9gej3o0q8oi152e1b2rpncglq6/38774178589.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/3c68a10902ccdbf8e91ac5bd4bccb3da/78417783220.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bcbc4480f1---39565281164.pdfIn PDF document text
    • https://es21sys.com/userfiles/file/lokukediladoriridevog.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c46d12463c---29705225591.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/gamolikat.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/631dd6a9e5b0b67ed9edcbec73cd104b/gaguxubuzoxuxibaf.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/xabifolufutez.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607018de78af6---momikubebexojo.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000121ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121AC 10888 bytes
SHA-256: 806a4bae5fdcced08d256185def88d2e6a0c2087e5e03f502ab4d71bf81b68a0
font_01_sfnt_off00013ad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000152e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152E3 18892 bytes
SHA-256: 7f4a69cfe39bfee447f6351e1fede15bfd041a24fde4b24b03bb4a66879e3676

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