Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6527d5ab8a01a14…

MALICIOUS

PDF

100.8 KB Created: 2021-08-08 10:26:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: dfd74908db04157a67b1c2a9403bb344 SHA-1: 8ee65eebb6c67bd6ef435afa24b4baf76cc4ecaa SHA-256: c6527d5ab8a01a145e7e80c8973d666dfe9a8ed2d040184cbf4ca8ffdc62ea8a
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9867

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://catamma.ru/uplcv?utm_term=what%27s+another+name+for+a+celestial+bear PDF link annotation
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16084c209d7b3e---93766136291.pdfIn PDF document text
    • http://www.romanschatztruhe.de/img/files/fuzadevubutid.pdfIn PDF document text
    • http://culfordequestriancentre.org/UserFiles/file/fajodoledeg.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/7ptr9q0o52qm40pcmoubmv6s8c/xibune.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c0c8e70ef10---pobulomudumasewejowanud.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebe4ef2a93---84050842346.pdfIn PDF document text
    • https://superpart.com/files/mewalagilim.pdfIn PDF document text
    • http://short-story.ru/upload/file/tasebogifemizowegofukule.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/29889265850.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ee27a29dc4f---korujodakipibus.pdfIn PDF document text
    • http://sun-tes.ru/files/file/7994977788.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/dnt7k6bk1g7ou6uqls0e4hrau2/lakanokawuwuzofaxebujebo.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608784ceb5fef---47436761222.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/xololixubetiwizogoroluruw.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/65862964300.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/xorevanawebesomifenop.pdfIn PDF document text
    • http://jar-ted.pl/file/pezuwedonubazagebu.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/kufanevowodejaxetimuni.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e5e832c869d---72656836065.pdfIn PDF document text
    • https://esz.jp/img/editor/files/binolanonozafexi.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/70954449111.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073034d7b11f---buzoxolilukarori.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/8789613363605f293767fb32cb137d60/76444685300.pdfIn PDF document text
    • http://nanopena.cz/upload/file/91182890247.pdfIn PDF document text
    • http://davisfolk.net/clients/1/1f/1f1070e31f35868a9a13f38ee7dc887f/File/jobivevawadi.pdfIn PDF document text
    • http://firegallery.ru/img/upload/58580255244.pdfIn PDF document text
    • http://lungtransplantopen.com/clients/d/de/de7cc03d42bda6b8b84c8ac9728529bb/File/61474959470.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000126fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126FE 2312 bytes
SHA-256: 225c0d757e4d0d6a808411299ed8213ebee368952897e2dce3f33ccc37f89196
font_02_sfnt_off0001311e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1311E 25164 bytes
SHA-256: f67cfb7124236550d249b5db2720b03127367bcd4b3d1dbe7b2fb7c0c77cfb4b
font_03_sfnt_off00016ada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16ADA 10768 bytes
SHA-256: 5d98cfbde9c36d21275a06ab25b9621e768ef306434a7ccf32485edf34b43b87

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