Malicious PDF — malware analysis report

Static analysis result for SHA-256 a320bbf1bee221de…

MALICIOUS

PDF

70.6 KB Created: 2021-10-01 03:26:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9aa0f4fd8574ec23c6776d3205fadc7b SHA-1: c93029612bd002a0848b51c72932a8320d711579 SHA-256: a320bbf1bee221de460cfe43a7fe018d71ff121a33fd2379c6f4c60e80a044c4
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The document body is heavily obfuscated, but the presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://skykharchono.mn/editor/files/27482505932.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/agghi4v1m3gp1nm6v30nvr72sm/watifalamupel.pdf
    • http://aaaexpressac.com/userfiles/file/duvebuwelutem.pdf
    • http://hoangnamjsc.com/upload/files/85942324711.pdf
    • http://fapannimario.it/userfiles/files/94784075249.pdf
    • https://aramlasmerok.hu/uploads/file/2877241096.pdf
    • https://bamfieldrental.com/userfiles/file/sajezepoputogejeg.pdf
    • http://davcpundri.com/css/file/samuziretugojudujepap.pdf
    • https://www.cascatai.com.br/ckfinder/userfiles/files/mezaso.pdf
    • https://alsharqcc.com/userfiles/files/14383077309.pdf
    • http://hidropro.hu/upload/zuzovibuji.pdf
    • http://ducnhua.com/upload/files/76532418824.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8666433e8---xupuweki.pdf
    • http://grossbuch.com/upload/file/61624416687.pdf
    • https://almuhja.ps/ckfinder/userfiles/files/87536793887.pdf
    • https://es21sys.com/userfiles/file/jetekifosekejolexafe.pdf
    • https://yoimart.com/upload/file/20210908073038.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c00a443837---wazokawu.pdf
    • http://claudiamelchior.it/images/file/82419885429.pdf
    • https://villamishkan.com/310renonew/front/images/files/46903871639.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/161400a63c72a8---83276342520.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=use+android+phone+as+bluetooth+speaker
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b146.bin
e7309d9b46716196bdefe1f237591d752986e75c0814cb468af2c05f4b4a943b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB146 10828 bytes
font_01_sfnt_off0000c9ed.bin
eb29d136564dc55d3f8301fbccc98e06fc0ebece4059f2c231fc101952836e72		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9ED 16564 bytes
font_02_sfnt_off0000f492.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF492 16792 bytes

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