Malicious PDF — malware analysis report

Static analysis result for SHA-256 155f652327ce66f9…

MALICIOUS

PDF

88.6 KB Created: 2021-07-24 21:51:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f68e6e122f66bd370ac477e7be7c22d0 SHA-1: cb9bfed2cfb05fbb3f12be368ea47c4246d98f03 SHA-256: 155f652327ce66f9a9cfd461c3630fb3848a68962d9b1c33900a521fbab428dc
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://xtra360.net/campannas/file/33707067964.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb501057b94---bizizavepurodinowizone.pdf
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f3b3f7acb70---65604921908.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a27bdff13---57674937880.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4e7ba5463---19377789658.pdf
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/e50bbd0c054df6849bde66d5a8e9ec66/80207683574.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160800ebc6c28f---2940490077.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d01fd4625ff---duginopimazijuxegeme.pdf
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/kg92e8blsqgb6spqhn423lguae/mofikanisodawulutisagin.pdf
    • https://briljant-maleri.se/UserFiles/files/3361299600.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/tkvpaluiu3i7i9j28uj1j2ck5n/zosaguna.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/h12s965i6kv5t43jhcuhejg1l7/monumagugepa.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16081679fa6c5d---pobonisotogujofebu.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/2fc41e00edbdce66a9e9f7fc23e2d278/32752970933.pdf
    • http://marymo.ru/uploads/files/42623204857.pdf
    • https://betenrealestate.com/sites/default/files/file/31861139516.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160bc447f44eae---28177933179.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/4dls0c7v8nb50u4erqnkmn0qut/29576093987.pdf
    • https://avonsteel.com/UserFiles/file/37580377704.pdf
    • http://xn--2-140-swe8h.xn--p1ai/files/20152301583.pdf
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/ddc944128b563214b21631c2d61c9b8e/5457863255.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf57b928a02---45224765300.pdf
    • http://ngocvietbungalow.com/upload/files/18909418196.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160725ca524c44---90575045325.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d3267a61a40---rikozulowo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+drain+lg+inverter+direct+drive+washing+machine
    • 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_off0000f645.bin
0cf29fe36f0e7a701524ddbb6ab168f138635deebadb8bd952946ce7158fc573
pdf-font-stream PDF embedded font (sfnt) at offset 0xF645 16672 bytes
font_01_sfnt_off0001216a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1216A 16792 bytes
font_02_sfnt_off00013981.bin
6521137fb8dbd3940459f655b2f74aa15580c5d8f86343caa137fc90def7ae3f
pdf-font-stream PDF embedded font (sfnt) at offset 0x13981 10960 bytes