Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4d4f7a1f0bfca96…

MALICIOUS

PDF

83.5 KB Created: 2021-09-01 14:24:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 82cb57ab31055cecaa740ac6182dfab5 SHA-1: fb65aac1cf21537079eadbd5a60197fb495594a1 SHA-256: f4d4f7a1f0bfca96b8db63170060cc34fe01d1321dd09ebea35c7a413176d453
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with several URLs pointing to compromised CMS uploads, suggesting an attempt to host or distribute malicious content. The presence of numerous links and the use of disposable hosting patterns are indicative of phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://southwestlooms.com/admin/userfiles/files/piraxube.pdf In PDF document text
    • https://cncostruzioni.com/userfiles/file/tebebiwos.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/565f8a60b6a2dfb4d2c709337f75afe9/65723742067.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/85b8c380ab72fa4aad553ec79b684735/losivupuxulexivozebilabu.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070576ca0797---lojabudesanopofinez.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0edddf932---posotosagalosapuwewoburat.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/lixebagaja.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/4o9rnah1s8o7tk39cl0h53t0ra/97988926843.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/58684487345.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/viwamiratitezamiguxeralir.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160712ab983a22---34539366271.pdfIn PDF document text
    • http://hajni.pl/userfiles/file/37928811551.pdfIn PDF document text
    • http://jfkanacon.org/data/userfiles/files/detaxazuwabixevorofojifu.pdfIn PDF document text
    • http://krasneclanky.cz/uploads/24867925852.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/matotamowugox.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/52496637329.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/wutofubazogibelax.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a630a0cb497---jonavon.pdfIn PDF document text
    • https://arabacioyunlar.com/calisma2/files/uploads/89385058589.pdfIn PDF document text
    • https://menu2uplus.com/images/file/madukunugopizogus.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/51383599252.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/turenifofojagebusu.pdfIn PDF document text
    • http://iphysiology.ru/upload/bamifovu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=slow+cooker+chicken+philly+cheesesteak+recipePDF link annotation
    • 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_off0000e07b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07B 18096 bytes
SHA-256: 27777629e026a789dc701a2e7c66013e422662b7dc6f97e265f70b0eb93056bb
font_01_sfnt_off00010eb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D0 10840 bytes
SHA-256: a14437d7c017d55cda5df6eeef4bb22daf7b45f5bbdfcbfeef9088f13269905b

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