Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e4d9df532b49999…

MALICIOUS

PDF

92.4 KB Created: 2021-06-28 09:10:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 27ebc505e3ec4d050e9a634c3f3ae729 SHA-1: 78aaf9753b38c28a4dc9446b59f01023adf5e793 SHA-256: 3e4d9df532b4999945bd17a598967755593c2be07d645421ad107edb8d7ff3cc
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be compromised CMS uploads, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics and AV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/akhgcm6e4l2c4pfn8328bshlvn/fixolebiziguleti.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085be5a5230d---xuxatukapabesisapapivudus.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac039ec43f---79833991105.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b810ea404d6---51799019347.pdf
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/l8c6cb7rc8rsdr6pfkg51jc785/mumuxige.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c587747aea3---gobumaka.pdf
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/sofidoriwukidure.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/69724cc0863f0d0cb3719c3254aa5e70/53831196846.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9db640e06---pinonarodebudamagabul.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/e52268fa2e86ce8585927750b3402e7a/27541697807.pdf
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/ab7201349d7fe8df45f0bd0dbb8ed3de/rotalizolipomaboki.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/57849414b022e8c4637ff88290e509c6/wemegofanor.pdf
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/086760b4f4ad28f47732136b4d68ed65/zudobasedezipaduvorufukaz.pdf
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/loi5qmtr6nd583gqv7e4aau0fp/sepopi.pdf
    • https://europartner2.pl/uploads/xefogubukenus.pdf
    • http://backkwang.com/userData/board/file/74913400347.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/03d2b134c7c40c6708d8dc2d8471c51d/75323612415.pdf
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/82fc8dcf5002d312246f1034320128fd/dijilofamisaxidebe.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1df229464---69647010171.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160920b1c86c43---92842644404.pdf
    • http://taxilitomerice.cz/ckfinder/userfiles/files/58915776144.pdf
    • http://barbusci.it/maisUserFile/file/sobakabixilewupipitawem.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d6e9808fc---fudobobisogizo.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/4265572b9ae8ca9da6d84e48421ab379/penopiwasikine.pdf
    • https://alkalacarservice.com/public_html/userfiles/file/813934797.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=icy+tower+1.0
    • 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_off0001059b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1059B 16792 bytes
font_01_sfnt_off00011db2.bin
7dd0da345ea4a12f3b213534bdccc967d82325e1942abf58346528525c6dbc18		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB2 10040 bytes
font_02_sfnt_off00013440.bin
53fca2b846763e7502371955482032716a46ac4d483a7e9334e63939b23a63fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13440 17732 bytes

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