Malicious PDF — malware analysis report

Static analysis result for SHA-256 15b4a6f9d5fb65f7…

MALICIOUS

PDF

94.2 KB Created: 2021-08-06 15:48:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0e6c4dc2ed3d2b9dfdb2dbb7da977b91 SHA-1: 4ae0f6b1c7c7e2cf975f0e9242057b3a8ba36e65 SHA-256: 15b4a6f9d5fb65f7e3e0b0061aaf7ca1d7300036670d4568771da9cb6e4e7ff3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF document that contains numerous external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs suggests the document is intended to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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=russell+hobbs+rice+cooker+user+manual PDF link annotation
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083173e129ae---tirexerixapelolanepovubix.pdfIn PDF document text
    • http://veterani-pushkino.ru/userfiles/files/56538708765.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160fde8ec471a5---92591045184.pdfIn PDF document text
    • https://papiratisk.cz/soubory/24372673752.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/78f48431c674ded8b7ba1e6a173b1c02/68680832173.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/xidipujanenufugaz.pdfIn PDF document text
    • http://faradbox.pl/files/file/19757409211.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/02c241a9f5615b1de1490be7852a258a/30179898218.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/fuzelegasu.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/33648076894.pdfIn PDF document text
    • https://wipaphun.com/UserFiles/File/38763461125.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/36456027910.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/xejolumaluxesuvizoge.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb00b889a29---lidarokuwipazukovu.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1606d073306085---nakubuxusifi.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/10944593168.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9bfe63d08---belisijekuka.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/t36ednolv5v8nqefceihq36vl0/86505496549.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c6528660094---88140699113.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/zusimatupodivek.pdfIn PDF document text
    • http://atrsara.ir/resource/files/lafojazovimujo.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/76629266323.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-4/20210504164538152097.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_off00010a1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1A 10772 bytes
SHA-256: 7928795cf32347274adf7ed1b74b452c1b15b3f1fd7b68c482c288c57648c4d4
font_01_sfnt_off000122b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AC8 18088 bytes
SHA-256: 68158f3806cb9f98d264294f56de316820a8d40f6999acdf05a54453928ccfa7

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