Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8ccecde4cb68503…

MALICIOUS

PDF

73.2 KB Created: 2021-09-12 20:59:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f860fdd1b879d40b00d5a2c67e6fc2a0 SHA-1: e752b723b957bee5ef1f7426bed74700e562748a SHA-256: e8ccecde4cb6850320647853112bb388ee5800c4ba4df2352268ec52f0631703
176 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using these sites to host or link to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://hsound.ro/images/custom/file/88473435555.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613402f374e82---22539661378.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161331a17a9b56---67556264421.pdf
    • http://kondicionery-noginsk.ru/upload_picture/file/81365770777.pdf
    • http://asiadomainstore.com/userfiles/file/1670511576.pdf
    • http://www.niziointerior.pl/upload/file/55966295806.pdf
    • https://viettrungson.com/media/Files/verosibatajogovur.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130847abb17f---kerezenosisavovezu.pdf
    • https://er-cardiff.com/eurostyl/photos/file/43718518472.pdf
    • http://140.121.180.103/ckfinder/userfiles/files/56193603767.pdf
    • http://sushikyototogo.com/uploads/files/81099001801.pdf
    • http://moneymaker-gold.de/files/24755363419.pdf
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/xitaj.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe9742bce4---38903487883.pdf
    • http://upsshop.ru/ckfinder/userfiles/files/potebamase.pdf
    • https://istruttorecinofilo.it/userfiles/file/25950051088.pdf
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cf793399f725d9bea24a61fbc13404ce/26410246128.pdf
    • https://karapinarinsaat.net/userfiles/upload/file/bexufeposikipikuda.pdf
    • http://www.ecvbrass.ch/user/web/file/pomigofejalitiditavem.pdf
    • https://hanyauntuktesting.com/contents/files/bunigenefetuvige.pdf
    • http://joesservicecenternj.com/userfiles/files/noxonovovemure.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=installing+kodi+on+android+tv
    • 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_off0000be1e.bin
fa559c8694c043d3e72ce8bd86703ae929eef5e6059d4c8c7bd3d6b2cdac0c9e
pdf-font-stream PDF embedded font (sfnt) at offset 0xBE1E 10400 bytes
font_01_sfnt_off0000d58c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD58C 16792 bytes
font_02_sfnt_off0000ed9e.bin
d5d1fb7ebed23252b14436d17f83dd3663eecdffba0767042166f4b97c0e0fc7
pdf-font-stream PDF embedded font (sfnt) at offset 0xED9E 16308 bytes