Malicious PDF — malware analysis report

Static analysis result for SHA-256 f32db4449e9da540…

MALICIOUS

PDF

73.4 KB Created: 2021-09-10 06:49:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9e685c9014d918eeaef518ef7eda0e86 SHA-1: 602ab429b8f320861c09e63d608793f64250e9a5 SHA-256: f32db4449e9da5405935e1fbe72434516814aeccadb21bfa4cb710cc4c4ad75b
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised CMS platforms or disposable domains. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly suggests a phishing or SEO manipulation scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://073741256.com/uploads/files/202109010551079036.pdf
    • http://wx-bm.cn/upload/ckimg/files/202109071346226405.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4f2bc4523---tesipigaxesakatejewix.pdf
    • http://think6.net/ckfinder/userfiles/files/20210909005048.pdf
    • http://lnimeina.it/userfiles/files/36232065403.pdf
    • http://www.europesolidaire.eu/userfiles/files/losenazugeruzebivezakejav.pdf
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/tudususuxog.pdf
    • http://aodaiminhhanh.com/app/webroot/uploads/files/kodilomagajumumoz.pdf
    • http://myucpb.net/userfiles/file/fajobadokib.pdf
    • https://www.bnbtravels.com/ckfinder/userfiles/files/retumarofidatemufatikovaf.pdf
    • http://xz-brand.com/ckfinder/userfiles/files/mokofikutexarokevasix.pdf
    • http://uklearningnetwork.com/userfiles/file/32852964902.pdf
    • http://futuralagoparking.eu/userfiles/files/29034747873.pdf
    • https://noelex22.org/userfiles/file/57424421077.pdf
    • http://citygclub.com/ckupload/files/60285655518.pdf
    • http://ainut.fi/userfiles/file/62401650554.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138553e15d38---82862180001.pdf
    • http://gaziogluenerji.com/images_upload/files/kifil.pdf
    • http://myapartment.de/web/editor/files/97403345928.pdf
    • http://batiment-tunisie.com/userfiles/file/puzitigimi.pdf
    • http://www.deewanalarab.com/up_imgs/raropuzimuxamamoduxa.pdf
    • http://sangjeom.com/userfiles/file///wenopeb.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/9f4ab3b05040ad529e6d7082f27b9789/34931251016.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=redmi+note+9+pro+imei+number
    • 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_off0000bba5.bin
7fe4a44320a81e9b89c13ba9e56b006aff1a31551c24442b5b011e76bd26fe2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBBA5 16992 bytes
font_01_sfnt_off0000e7a9.bin
b97013fadf6e16a86bc82026bebdbd9c81a3cd0809c5fcfa469327c49cad21e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A9 10628 bytes
font_02_sfnt_off0000ffb5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB5 16792 bytes

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