Malicious PDF — malware analysis report

Static analysis result for SHA-256 0eb5133af8cf73e3…

MALICIOUS

PDF

87.7 KB Created: 2021-08-11 16:55:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ae1c061df4370dee591937e307ee213a SHA-1: 08f7321eba44024d2efdd9a68a4a57d1a27d7f4f SHA-256: 0eb5133af8cf73e3ca13b2fd76d2db7168e612bdc8620893e7cad431eef63da6
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or redirection mechanism. The primary purpose appears to be directing users to external, potentially malicious, URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://infrive.ru/uplcv?utm_term=galaxy+invaders+alien+shooter+2+mod+apk PDF link annotation
    • http://jmvlpslimited.com/ci/userfiles/files/godotifobuxex.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/33385862453f94eee8e87d1d39fbf04f/jetojomu.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/1e19cb78868e98452026e8b600213ec1/13773245433.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cda650d3dac---2560255151.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160703e946c872---ripas.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/tuvelisuva.pdfIn PDF document text
    • https://dafelia.com/files/sumitoliguberaritifitipir.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/46815931369.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/a686bae164cf1d62c7a7e2c02fd95dc1/17438373510.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16090c178585bf---tofenidipaweneruf.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607275f1c8a72---pitofisiborolenevabobewiw.pdfIn PDF document text
    • http://flexa.cz/docs/file/93901858626.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/nugalerekidobexopugisuto.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/jogumobuloxew.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6db236a19---nopotimajed.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161061f3d994fd---pumesidakesi.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/5doljflpkn693391hk2k9rg0tr/81157630825.pdfIn PDF document text
    • http://vaikevai.com/ckfinder/userfiles/files/78041376325.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/kojixafoneleditametaluj.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/2ooekpprdvfb7qt2bmqcks5ng2/radol.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/61224180615.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/vamezotofutilile.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160712158b66a2---nesisupurakebenoz.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_off0000ef87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF87 11188 bytes
SHA-256: 66d73459d1eff85a50d03af03cad827168ebbac5a2541b576b338bbdf8fd2307
font_01_sfnt_off000109a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B9 18388 bytes
SHA-256: 7d40b11758009725ff7c17e220f599bd3360bc6576cf615c0a02565be0d7cb1f

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