Malicious PDF — malware analysis report

Static analysis result for SHA-256 d91e046d375c2bbd…

MALICIOUS

PDF

89.7 KB Created: 2021-08-20 11:29:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7991ef312c3d7fb3aafa0545b6bb1e70 SHA-1: 125131224cf4e49167d97615c5c517ca2967523e SHA-256: d91e046d375c2bbdd907c66a286d053f331627043652f27da76f9b95214d8a01
156 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://catamma.ru/uplcv?utm_term=how+to+take+apart+a+coffee+maker PDF link annotation
    • http://nanumed.ro/uploads/files/29429390249.pdfIn PDF document text
    • https://moiatakashta.com/userfiles/file/zadede.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610825ed6e968---mipejezabu.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/xolid.pdfIn PDF document text
    • http://olversonfamilyreunion.org/clients/5/51/51a48c89da211807e19ed56f8a1a1822/File/zemod.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607650ac7416a---89692322328.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16075023f2bc2d---17950681827.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/24652124929.pdfIn PDF document text
    • http://www.flamanville-76.fr/upload/file/47510297547.pdfIn PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1626727971.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/wewos.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/deziretezunavam.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088e8e0a9f26---75286390955.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160fd95a72c8f7---mofawelexuxulagepuv.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a35b3dd4b48---8082997625.pdfIn PDF document text
    • http://scan3dsaigon.com/upload/files/8949814327.pdfIn PDF document text
    • https://vinamex.info/uploads/news_file/tedapu.pdfIn PDF document text
    • http://ubest.ru/images/file/7912821031.pdfIn PDF document text
    • https://morabia.fi/images/file/8475797881.pdfIn PDF document text
    • https://ccskin.com/geektic/files/misike.pdfIn PDF document text
    • http://pronobile.de/catalog/file/39301559944.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_off0000fa36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA36 17160 bytes
SHA-256: 1e6a5b1a4ec78c99fc5819592954b80b037201753229b51a2bd50baaca219b7b
font_01_sfnt_off000126d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013eee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EEE 10400 bytes
SHA-256: 73a0084def9503fe8fddec637d5d97615c3b8b2fd9c143492b14d5116ba02443