Malicious PDF — malware analysis report

Static analysis result for SHA-256 264dce6ce5a74304…

MALICIOUS

PDF

80.1 KB Created: 2021-09-03 19:47:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 23d631bcabc4ac0b18ebf5b419a9419c SHA-1: 87e09db627f4c25456241a35faf9ef4ce7ac4613 SHA-256: 264dce6ce5a74304c4e35cbf408a1e51d8e6c03fe1660221f1a7e61f30c6b64b
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that lead to other PDF files, many hosted on compromised or disposable domains. This pattern is commonly used to obscure malicious destinations and distribute phishing lures or malware payloads.

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 https://crewmak.ru/uplcv?utm_term=bank+books+pdf+free+download PDF link annotation
    • http://aaronandanthony.com/userfiles/files/wowuxupi.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/geniral.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/86296523755.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/pomoko.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160865f48b8619---dowilokorunepoxibodopa.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/39466490337.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131518ee3adf---51082122854.pdfIn PDF document text
    • http://safarekhoob.ir/basefile/safarekhoobir/files/80502708152.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/taregaxutujipujefunixa.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/6ec0444e6b10c1c66a4e95d5d5b89b47/ligonizutaz.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b86ba29fdd1---mubodisafapi.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/aaiptdk58fvlsnrtu26m82teh6/betodowepazutujizatunuda.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/odp6m6s9q55rciuqgtd3kd1r4k/54481371126.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/79332476983.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/4ffef457f062eb174d71a1046302869b/pufisimabusokixavaxagugam.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210727012313.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b77a169356d---89737663567.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608d187040203---riwazerebimazer.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021052703401570.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/riwobukefofiziwixanul.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/wedogar.pdfIn PDF document text
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/dudikidoluwagizarumukunup.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e794a706de1---99315151717.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/61382c524ef16ea3ae05678058073764/dipowokikorosifo.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_off0000d420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD420 10672 bytes
SHA-256: b836356449c24b4069f9e0076cf6a45a17ae6fb5962ca3383631d4dfcc5b7c97
font_01_sfnt_off0000ec9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AE 17808 bytes
SHA-256: a14b872862413bdb71335e727364f704f43282122fecd73e2a6f8600728753b7