Malicious PDF — malware analysis report

Static analysis result for SHA-256 aecae4f20adc3c23…

MALICIOUS

PDF

85.4 KB Created: 2021-09-18 01:20:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4cbbb76abbacf8dbecff6a6fd61fd668 SHA-1: 8210f872bcbfa222c43489d9df4b2e4818e183fd SHA-256: aecae4f20adc3c2340a34fc87335762080d921a21bd56b837468f62dbc2f47c0
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farms, with several pointing to compromised CMS uploads or disposable domains. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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=android+generate+app+icon PDF link annotation
    • https://geniodelweb.com/file/pusorogif.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210901000010.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/jesaxadexa.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161445b7bea499---87552757768.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/natonozonikarobatowa.pdfIn PDF document text
    • https://theshamrockpublecco.it/file/mudizipikimemegibevozefab.pdfIn PDF document text
    • http://fu-xin.tw/uploads/files/202109120804394368.pdfIn PDF document text
    • http://gardens-spa.com/user_pict/file/limirevisapa.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/79069313735.pdfIn PDF document text
    • https://lostfoundglobal.com/userfiles/file/3355904966.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/buradajutezawokomiji.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/38708665362.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/19593130718.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/pubupinukijadekuwenugipa.pdfIn PDF document text
    • http://www.nbc.com.vn/ckfinder/userfiles/files/bosokejoxete.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/6pj0a1jn18m9venu8c0bqd6vaa/51474718622.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/dafilog.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/17589842021.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/mcfje4dgql6ljgf22sqojtu53u/pewol.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145055cc4153---56677727614.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/sigoxolevomitubur.pdfIn PDF document text
    • http://nwatchonline.com/userfiles/file/32581210382.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/89476219221.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d036b06ce8---dudiwe.pdfIn PDF document text
    • http://missteenqueenuk.com/userfiles/file/48288157502.pdfIn PDF document text
    • http://fiorenzuolatrack.it/userfiles/files/54476786022.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_off0000e97c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97C 18056 bytes
SHA-256: f5d5f9587a53bddc8b2afc93ac2d19ce45078ea14689dfb9890aa5dd57165975
font_01_sfnt_off00011862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11862 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13079 10456 bytes
SHA-256: f1a3c090a707697e698e24d1f6c421efc0a473de9b501e0fca54aed58c602b78

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