Malicious PDF — malware analysis report

Static analysis result for SHA-256 f68eaaf7d59d9237…

MALICIOUS

PDF

70.8 KB Created: 2021-09-25 00:28:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 28a15164ae56143d60a384043b2cd0a5 SHA-1: c371cf0780fc9793db0730db83907b9e1d033828 SHA-256: f68eaaf7d59d9237124ebe1b2e96f61f3ecb434f03d70dbf2178b341da9325ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the nature of the embedded URLs and the 'link farm' heuristics indicate an attempt to lure users to external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/475e9094bc27edaad03f6044e1517f86/ginajomosonefosunikuki.pdf
    • http://luluscafeonline.com/uploads/files/sadezutamozarokinobenafi.pdf
    • https://nnkcreations.com/userfiles/file/bojaburinalaramutuzi.pdf
    • http://gd-weimi.com/upfolder/e/files/20210924085915.pdf
    • http://xn--j1aii.su/userfiles/file/28659610982.pdf
    • https://supermagnum-bg.com/userfiles/file/xubibixosojokudizise.pdf
    • http://americandeliorder.com/uploads/files/2521324461.pdf
    • https://ripedesign.com/app/webroot/files/fckeditor/file/45751379327.pdf
    • https://cplastik.cz/data/cms/file/gagalumo.pdf
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/73086708079.pdf
    • http://itena.si/uporabnik/file/15473858993.pdf
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/38847932152.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16146947e78a3e---gajagevazusem.pdf
    • https://jasz-pap.hu/UserFiles/file/19566398540.pdf
    • https://tanthueviet.vn/img_data/files/19745261968.pdf
    • http://rungruangsteel.com/public/upload/userfiles/files/53567376157.pdf
    • https://facades-et-traditions.com/actualites/file/luwuno.pdf
    • http://bioaec.com/userfiles/files/6168541631.pdf
    • http://zae.me/datafiles/file/ruluzupijige.pdf
    • https://at-studio.tw/app/webroot/userfiles/files/20210916_001729.pdf
    • http://itagqatar.zajeltel.com/itag/file/files/34472930411.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16147810b4000f---81090768197.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/d1b01fa1af67417633ae9d757c7b666e/25359332058.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+install+pubg+kr+obb+file
    • 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_off0000b2b4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB2B4 16792 bytes
font_01_sfnt_off0000cacb.bin
d4debbe4bd4fdb5ec619d4683ce0ee95de62454e4dda0803c970577cccc7283b
pdf-font-stream PDF embedded font (sfnt) at offset 0xCACB 10940 bytes
font_02_sfnt_off0000e417.bin
08bb5dd3cf5eb9c91f1b72288cc2912adcb8b2713de32fe172d7bcd7893a60c6
pdf-font-stream PDF embedded font (sfnt) at offset 0xE417 16152 bytes