Malicious PDF — malware analysis report

Static analysis result for SHA-256 0549c51bc8896713…

MALICIOUS

PDF

83.3 KB Created: 2021-09-05 09:26:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1374939078c5635af0694c1dadf38d97 SHA-1: 176e2d027aafcaff781ad8fdb85501567550fcf6 SHA-256: 0549c51bc8896713c5eb1b705214ee4e1b70e3446096e7932d46e81450a84242
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable domains, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://garglob.ru/uplcv?utm_term=dahlander+pole+changing+motor+pdf
    • https://cissud.com/uploads/ck_editor/files/lolikoxovupinagiritivezet.pdf
    • http://beepost.vn/upload/userfiles/files/kadoxukugolul.pdf
    • http://canoeing.by/pics/files/89922828333.pdf
    • http://honyi.tw/ckfinder/userfiles/file/43020751707.pdf
    • http://sclifeguards.com/clients/16854/File/78348231632.pdf
    • http://citygclub.com/ckupload/files/35584779268.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd7e00aff38---toxavanijabunafuvu.pdf
    • http://gildiamasterov.ru/userfiles/file/19073924780.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3dae7e022---27696212588.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612001b72efcb---dowiwovagalexonudevuwi.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790c659d82d---82707528945.pdf
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/c3770c316f2470a9ea447216ecf5c78f/14274073821.pdf
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jeluzunokofav.pdf
    • http://geometrabottero.it/userfiles/files/jexejatelekasolejijagidez.pdf
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807b1116bb3---71278052566.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/cda74eb95900573d751627b7f2f3f854/14805528020.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16094fafbb870e---lusaxalidekusi.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab57ea90558---fedufusuburexuwix.pdf
    • http://guoyangmoju.com/userfiles/files/82351394872.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/7d3e6b9654138bc1969cbb8fa0d5cfec/kagafukudeludagegijozu.pdf
    • http://ehomeforeclosure.org/images/file/xusafusewalubixupobedulis.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a3400219f---85804207952.pdf
    • http://pelesiuvalymas.lt/i/File/tekebedabofozumim.pdf
    • http://yule-sign.com/upload/editor/file/20210813101746.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_off0000db56.bin
2157f9afcd4f7e509098e38c3140b9ccb31e39efb6907c8ce27ecb835c1b1c25
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB56 19168 bytes
font_01_sfnt_off00010e99.bin
a58940b3914b03ae82949f083918657833884d98feadb7e136d218c837865638
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E99 10900 bytes
font_02_sfnt_off0001275b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1275B 16792 bytes