Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c639a26bc7db8e9…

MALICIOUS

PDF

95.2 KB Created: 2021-09-08 03:59:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 4b46d4e82f5139cd8c42ef967312aeda SHA-1: 3fcc1ad1309f1f5b57aae8865636c7a981841084 SHA-256: 9c639a26bc7db8e97701f9d82b87d0b85ec16afd49fb256fb0edf6d055a777a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to compromised WordPress upload storage, likely intended to redirect users to phishing sites. The presence of numerous external URIs and link farms suggests a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://drafthe.ru/uplcv?utm_term=fierce+conversations+workbook+pdf PDF link annotation
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf9fc7c216---rarotuxebepazop.pdfIn PDF document text
    • https://guijek.com/userfiles/file/55848775405.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/5j31riifb1u338bd1g9tg0mote/xogaxigizekunenepadivaros.pdfIn PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/11198998856.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa14756027---butixilevuponisiketabufe.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/eb037123c9715d6f2cf503f944db3518/13589457444.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/xuvekejodinoripizibopefi.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210518024450_0x3d1m.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/21216549244.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d53e4c52a1---66907412294.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/zozatubawojo.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/ea8mn9jgm6st9ikpbpa4ifa6v3/26712670762.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbf5af98935---56468045507.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/77199956305.pdfIn PDF document text
    • https://idosekotthonaveresegyhaz.hu/files/files/natuwaveborujefuminukoru.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/0vqtfjihto9dk9dk5gm8oths3e/36979822532.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/dewarigepon.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/c966ffca37bd5976c0f3ed81ac1ba8b5/runuvutimizuzomise.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/11937786954.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/33310145604.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/h8su49j5di71g23eflv6kqei82/18306224047.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/qt99enku1f9mf9l96nnl4t94gn/vavudinusitujorujezevozo.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1627333586_44a7ddea2a.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/06/files/210617114541.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/16070f0c92044b---71234937010.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_off00010d77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D77 10928 bytes
SHA-256: c828b02f34964cde8ae88605da5cb840c06a46eb02f4d4ca4edac3018009b708
font_01_sfnt_off000126cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EE1 18668 bytes
SHA-256: 2aaff67b2752797113408f6957224a84188162c2be943134a5fbf78259bbfe13