Malicious PDF — malware analysis report

Static analysis result for SHA-256 a000c118a11dc4d4…

MALICIOUS

PDF

73.6 KB Created: 2021-05-24 07:10:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8876e40b814c7fa57418895741ba9630 SHA-1: 1fb6e48b6bb272f3c616b5dcabbd4f13a00d2ffd SHA-256: a000c118a11dc4d41295e888594036dd270170db95be20511f9bf56401e5bbb2
156 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which appear to be compromised WordPress installations hosting PDF files. The document body mentions "Bluetooth software for windows 7 to connect mobile free download", suggesting a lure to download potentially unwanted or malicious software. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://smidgel.ru/uplcv?utm_term=bluetooth+software+for+windows+7+to+connect+mobile+free+download
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/g1mo6cbmbop24q5mf22tlgubs7/78402808944.pdf
    • https://bursac.net/userfiles/file/45900200435.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1705698c5---xijofetexejijizagodu.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/mfru991ssfvqm0crc1g8dfc5ur/mabixunexogu.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/854b71f44806af33d85b569ed7e2e43c/95310648202.pdf
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/ad2d847b9c2adf5c77cff75215bce9b0/sevixozirusabebut.pdf
    • http://asfalon.com/__files/file/13743728988.pdf
    • https://alice-immo.com/userfiles/file/25400260736.pdf
    • http://alexhofford.com/temp/files/file/wowadulagenemag.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/1a0aa8048a5ab3ac34d7c50c8c7ebfd7/76610631869.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/22203819b790ea557666fbed2fb201f8/38045249748.pdf
    • http://akkoryazilim.com/userfiles/file/nedafimovomegew.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3d0ac982e---83392077513.pdf
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f54da6956d---vuxiluredipomezoz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6a0.bin
b4baab5dfc1a8ebef1317ff8e3853cdbe4841307844ddd80b9f301646ce3e24e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A0 5504 bytes
font_01_sfnt_off0000e940.bin
f2d9d68783df06d0c93de23f0be2f5884438c1000e01707406d862d9fdf761fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE940 9792 bytes
font_02_sfnt_off00010aac.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAC 4324 bytes

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