Malicious PDF — malware analysis report

Static analysis result for SHA-256 564581a97a37e2f1…

MALICIOUS

PDF

83.8 KB Created: 2021-08-17 06:42:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6e732661ae6cc457930b44b01fe26901 SHA-1: 81381875952ecad96c34e4a470457377dfe38060 SHA-256: 564581a97a37e2f11a711208779e0705401a4cc82cd9b98ff04d78c20497c23e
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users to malicious content. ClamAV and ML classifiers strongly indicate this PDF is malicious, likely a phishing or malware distribution lure. No scripts were extracted, but the structure and URL patterns are consistent with a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://krisoc.ru/uplcv?utm_term=kelebe%C4%9Fin+r%C3%BCyas%C4%B1+izle+tek+par%C3%A7a+hd PDF link annotation
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/e68idu4gep27rrl93hacjnpucj/gonukesexadanapogaxe.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/75120902582.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/13027429631.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b23a9cc87b2---wawizexenemanof.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e8552daeab---rumibufa.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ed0083b43---xiwegumerituvinifo.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/bdce37ac74b392e4d4eae43e8e9ee87f/83472859385.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/venipisokadit.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ca30acea157---dugukivupifetaruzubaji.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/supuxeripuzupurivoligon.pdfIn PDF document text
    • http://redhillplantation.com/clients/1/1a/1a02e1fabf1298af97853074613e4b20/File/42870637549.pdfIn PDF document text
    • http://agroanaliz.by/upload/editor/files/bepekamun.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6686998b3---33584535281.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/tifefofuvok.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/lugutatagilipediwoworajov.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/25249463375.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608461459421a---fawon.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2be05df338---laxonigekezirevivixew.pdfIn PDF document text
    • http://coffee33.ru/archive/file/magaxolulovereminadeberu.pdfIn PDF document text
    • https://ekaplast.site/admin/ckfinder/userfiles/files/jifasovevoxavazejevev.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/54609383224.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/14864636516.pdfIn PDF document text
    • http://lamgi.pl/ckfinder/userfiles/files/47630598928.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c88a1d493e3---letowofopuna.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/vazuredepimizumi.pdfIn PDF document text
    • 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_off0000de8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A2 11436 bytes
SHA-256: 695eef55806cea214c11fbc390a30a50049a5c60ebca50fb37ec0e0e2f88e942
font_02_sfnt_off00011109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11109 18532 bytes
SHA-256: a378f7488f82279695fe238cf3dbd6ce24049631917050c58a3d81ba62377dd9

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