Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0a4ac6c330249e8…

MALICIOUS

PDF

91.5 KB Created: 2021-07-27 00:19:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2bd8de341a8b7c68706628f596bd1498 SHA-1: c9a6b4f2133a4fda10c47e0d3115e5221e72ab5f SHA-256: a0a4ac6c330249e8eee2d2e6dd327f92c6ef628ac7ed12eb9692c153ff43422b
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or appear to be part of a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://benqmusicworkshop.com/fupload/file/jelofitavibebid.pdf
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/xinaxovixezilurasis.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e378c22884---jikusuketolanusazenumo.pdf
    • https://oceanflowerhotel.com/uploads/image/files/gevekebezizapalijalusaxik.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609141ae43583---rozimizosuzebesovet.pdf
    • http://taiyoaquris.cn/upload/userfiles/files/20210605133350.pdf
    • https://veterinarycarefoundation.org/userfiles/file/58224760145.pdf
    • http://arci-mp.fr/admin/File/towolewetomoliromifuna.pdf
    • http://guides2alpes.fr/uploads/file/93633428024.pdf
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/16a6dee1e2216e9b1ed8ad1703f39dbc/780427802.pdf
    • https://pjkconstruction.ca/images/file/83074499859.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c26cdd9aff9---jusobekapifego.pdf
    • https://ikincielinmak.com/upload/ckfinder/files/41558255457.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/cn8mfkqlhbugm5lv249li6un2d/15072636054.pdf
    • http://kenshopvn.com/uploads/files/gekatekevupikesezoduxalek.pdf
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/9gl61eh5497gn2pi0c732b2bms/wikebibo.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c94682985---11402820200.pdf
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/36u6len5one71qhaclo6pf0kl1/91425142128.pdf
    • http://fruhmann-elektrotechnik.at/gigejaperigalujonirukum.pdf
    • http://d4storonto.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/xenavakonoxorelet.pdf
    • http://aqbnb.com/uploadfile/file/xixasisarunamejodejusomez.pdf
    • http://www.monts.sk/upload_images/file/47523629343.pdf
    • http://gfhs1978reunion.com/clients/56625/File/tonipekadutamaxivatuwe.pdf
    • http://manpukuorder.com/uploads/files/dadekudez.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=kannukulla+nikkira+en+kadhaliye+hd+video+song+download+1080p+free+download
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dff6.bin
1c284f78e3c1062d042f3acd857b08f5e8658f3173445c09882077472da3d5d6
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF6 11512 bytes
font_01_sfnt_off0000fb05.bin
ae331a4c2fa0597e224ba1c6fe2339e6e414477d3ca7268991f176abd66b232d
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB05 16860 bytes
font_02_sfnt_off00012696.bin
3ded9aaca2ef9e6c6e95cee9882111b9cda0db582afcb602817e0619031ab472
pdf-font-stream PDF embedded font (sfnt) at offset 0x12696 18776 bytes
font_03_sfnt_off00014480.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14480 16792 bytes