Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2a22d478e07e24c…

MALICIOUS

PDF

90.6 KB Created: 2021-09-21 01:21:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4ee8b40e6d51570bc9b70b4f4f7f8a6b SHA-1: 336344f807198e61e4ed5320923c419026f97db0 SHA-256: b2a22d478e07e24c092fca6ee1c3836b2469d6c0e6eb5d25ab8989b7134b482d
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://allytemp.ru/uplcv?utm_term=saw+movie+full+movie+online+free
    • http://morebricks.com/ckfinder/userfiles/files/fefupewapivakufobaguxo.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16134180d81208---xixajalep.pdf
    • https://preciseenergygroup.com/media/67625248714.pdf
    • http://2478.ru/admin/ckfinder/userfiles/files/fanilevexisipe.pdf
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/penajudafavuki.pdf
    • http://status-go.net/gfx/userfiles/files/delotamudeladamekiwemenez.pdf
    • http://yourhandmadeitems.com/userfiles/file/fafiro.pdf
    • http://mamtomchabahai.com/uploads/files/files/fedepupusaros.pdf
    • http://longarmquiltingacadamy.com/fckeditor/userfiles/file/18984567800.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16141d933e8207---32264169796.pdf
    • http://chupanhnoithat.vn/upload/files/4378391156.pdf
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/dc251bb74d8b232c31788fe6abf90762/gafozed.pdf
    • https://rcot.org/userfiles/file/69299942909.pdf
    • https://mamotato.ro/userfiles/file/numowafugigetapadifadub.pdf
    • https://karolinanowak.com/userfiles/file/lareniwedozaxilineri.pdf
    • http://chuaphucluong.com/uploads/image/files/zigepebapafokunibosikusez.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4fda975b4---56346384723.pdf
    • http://rasciindia.com/firetech/ckupload/files/kivimun.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/13842bf7c8a711451f38f81f6ad05fc2/48907168247.pdf
    • https://virker-ikke.dk/files/sakijiwotadefokusukidigoz.pdf
    • 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_off00010008.bin
83a6c3773a5f977c374af886d62b275ee64df8f48a7075573074637b2010f766		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10008 17420 bytes
font_01_sfnt_off00012d08.bin
55c896c1d0b50dc5eb758704c4f314c6a5507cd665e8d2b6bbc011da2cc5ff09		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D08 10436 bytes
font_02_sfnt_off000144b8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x144B8 16792 bytes

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