Malicious PDF — malware analysis report

Static analysis result for SHA-256 7510ab158a08c582…

MALICIOUS

PDF

83.6 KB Created: 2021-07-13 13:41:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7df332da3917e1a7ef8a4c86a56e47b1 SHA-1: 7295537d0c437be12d8d5eb4b6586f308285482c SHA-256: 7510ab158a08c5821d81533cd68ad187b2ab233bf9bf34956d408266155da6ea
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, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO manipulation. The embedded URLs and link farm heuristics are the primary indicators of this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/1q39lgetvlbmam3ivhtshu6ltm/58494845330.pdf In PDF document text
    • http://citescolairedeledit.com/include/file/pepevekaxotesul.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/463e114b65f0ba09290a2ec0f3318c67/58711192122.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1609316b409c15---18938127866.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/3003399751.pdfIn PDF document text
    • https://waroproject.com/file/bugawedorodujarelex.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/2cda90a2bacd3cd975873376217e1c2d/28311861640.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/pinafaxugibel.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a90cab6adae---nubekofisubiduletodawux.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/3377419188.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf834e738e4---92827798214.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/kabowowa.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/0ae85e05e2b6142aaa8d0361181ae602/wujetadudexasedola.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/434099fe725516e90b1bd0d2607a7af8/sijabejitilusu.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/puxagow.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/40791158235.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/gidowizibevovuwawax.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/fofexaxita.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c9f62576e---84770567511.pdfIn PDF document text
    • http://cogersquest.com/clients/f/f6/f6194b381802d71b6842d6160e8859b1/File/xixitemomisir.pdfIn PDF document text
    • http://sillajen.com/fckeditor/_upload/file/25899825611.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/37c0397410b630bd1bb17abafd809471/detiruwa.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/mefefagopeguwadimud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+to+get+pen+out+of+white+jeansPDF 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_off0000e608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE608 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1F 10796 bytes
SHA-256: b54e90f6e482c14ae15772285ecfb34e564c43ed0920842039e112f5ac82ecc7
font_02_sfnt_off000116f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F7 16340 bytes
SHA-256: 305d11f257a4addb1df33c0b4c7f147c984245d3534e7378746526c8fc3d144d

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