Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e613275f3563f06…

MALICIOUS

PDF

92.9 KB Created: 2021-06-26 03:12:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: adfc44e5af6a101e841bd8c0bd63f0a5 SHA-1: 0346ac5801ca1015d605fae23d9338f3fea6c6a1 SHA-256: 5e613275f3563f06849317bb3bf567bed3aa971a87794d82350180fcf9cacafa
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous distinct hosts, many of which are identified as compromised CMS uploads. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The primary attack pattern involves luring users to these compromised sites, likely to download further malicious content.

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 http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d611403f31d---wakesaj.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/0rqeor3npnj2lc3qn987ddbdk2/53819741732.pdf
    • http://www.bandungmesin.com/file/velonujelinano.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082839bcffe4---bogewawedonelibomi.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0128e21e84---46643581383.pdf
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160874b205f46b---xinonubekazaz.pdf
    • https://acronimocostanzo.com/userfiles/file/wakutevanudapuravos.pdf
    • http://pension-erlkoenig.de/img/editor/file/59435098139.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160c15bdc2cbc1---98051427695.pdf
    • https://arrayamed.com/userfiles/file/nimiruxosuvi.pdf
    • https://anmoul.com/userfiles/file/basabewavatugixosunewag.pdf
    • http://olsztyntransportmedyczny.pl/userfiles/file/kolades.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd36e147410---58520927375.pdf
    • http://7166867.ru/ckfinder/userfiles/files/suluvoxuzes.pdf
    • https://yuss.it/file/pupokapozilugunademuj.pdf
    • http://sumterhigh89.com/clients/863574/File/mezimumurafowepasumorulod.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/92faa18d05af7d5f086f35ce25283a06/zagosuxizorozomitoli.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/fujq1i8tu9577fq0hsfrar42k6/dorivaz.pdf
    • http://amphorabeautyclub.com/campannas/file/zilenodesefivaruka.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c258f1670eb---14480799787.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160cb5bc4694ce---pumosinitasuwelat.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/6575051ef7d08e4fbea05d7a17b74ce8/83172108256.pdf
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/fexigewixalologuboxi.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d249c21bb---51022100283.pdf
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/5bba414d3cc3346acb2915afdb873e86/33441624072.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=chapter+13+milady+test
    • 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_off00010617.bin
0f1502717895ddaa1b14595d6397453d8ff35b9dee6fe9c746d85b4208ae8084
pdf-font-stream PDF embedded font (sfnt) at offset 0x10617 10800 bytes
font_01_sfnt_off00011f16.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F16 16792 bytes
font_02_sfnt_off00013728.bin
5b9685716d81962c86181ae8d97804479cc7d0c1be1a40bd78cdec37497bf140
pdf-font-stream PDF embedded font (sfnt) at offset 0x13728 17504 bytes