Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b69efb742b6b2d0…

MALICIOUS

PDF

81.2 KB Created: 2021-09-19 05:01:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 263da57c5011cd35ed3e6208247e012c SHA-1: 2996172189a8645db60afc54e2b7c454ad06e7eb SHA-256: 1b69efb742b6b2d05dc8ca6154538e6c15a2a19bcbc1772d42570aa6ece91d41
156 Risk Score

Malware Insights

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

The file is a PDF containing numerous embedded URLs, many of which point to compromised websites 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 distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/topenilum.pdf In PDF document text
    • https://handinhand-daycare.com/ckfinder/userfiles/files/73620901717.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7737eee2d---kugijipulivime.pdfIn PDF document text
    • http://kite-surf.sk/files/xesazetivenudeduvufox.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/51123496546.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/94814911827.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/fifatazapi.pdfIn PDF document text
    • https://efnnma.org/files/file/xoxopuruvifu.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613189fcd7071---80257060416.pdfIn PDF document text
    • http://otohondamientay.com/upload/files/zakis.pdfIn PDF document text
    • https://wanfutemple.urwaydesign.com/data/file/userfiles/files/20343909825.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/m1h3olfk97hv0o7s47t5j8cov9/53589142543.pdfIn PDF document text
    • https://dom-titan.rs/files/ludog.pdfIn PDF document text
    • https://purefeeling8.com/data/file/momifevanolasogokojitat.pdfIn PDF document text
    • https://kalimati.in/userfiles/file/femadupu.pdfIn PDF document text
    • http://gibisch.biz/files/files/93609661453.pdfIn PDF document text
    • http://bresky.cz/res/file/poburigasumab.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/om729dv0eenj4tkr0ht4j33cog/13378586613.pdfIn PDF document text
    • http://www.petercar0937494634.com/upload/img/files/98912775740.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/71601095255.pdfIn PDF document text
    • http://lpsa.cz/userfiles/file/xolezufofodisegoxesi.pdfIn PDF document text
    • http://cn-noah.com/uploadfile/file/56823960042.pdfIn PDF document text
    • https://groupekheidri.com/ckfinder/userfiles/files/geparizib.pdfIn PDF document text
    • http://wellogo.in/userfiles/file///67329268174.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/54177626951.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=lg+g7+android+9PDF link annotation
    • 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_off0000dae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE3 17704 bytes
SHA-256: b9a57b2d2c46d5b58127aabb6cc87da3e16f52da890ae34b16dd63dc6a8952b5
font_01_sfnt_off0001086c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086C 10156 bytes
SHA-256: fa522ad945faead52725992292ea60073ceaefb7c6236d2d8d76b75de487cda1
font_02_sfnt_off00011f03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1