Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0996dc76ac5c67c…

MALICIOUS

PDF

82.6 KB Created: 2021-09-15 20:44:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e29928c1987c71661d0712781673d0b8 SHA-1: 8c340abb3e13781484697036987de3975ab979e7 SHA-256: e0996dc76ac5c67c23e02073e81478ef2c521cfa991f9c8adc198c892024b1a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URI heuristics further supports the attack pattern of luring users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/dogaxigaxurefipuja.pdf In PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/todujawega.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/pipasakibi.pdfIn PDF document text
    • https://kalimati.in/userfiles/file/kuwefinojisese.pdfIn PDF document text
    • https://sambelteri.com/contents/files/biwobopepuzalo.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/39976718275.pdfIn PDF document text
    • https://biholka.cz/uploades/userfiles/file/37952083019.pdfIn PDF document text
    • http://zensushidanapoint.com/uploads/files/pavamezopeg.pdfIn PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/42967867314.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161326fbc291d3---xoteriwuvagotebatagadedad.pdfIn PDF document text
    • http://noithatnhapkhaugiasi.com/luutru/files/50761115616.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/161310da66196c---lagamirefevawe.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e5068b59d---tujasosifi.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/fupebegefagevi.pdfIn PDF document text
    • http://bangkokmagnetwire.com/ecodev_test/image_system/files/tazazekiduniga.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/95b6f85570b84b0d02637b5f3a416c7b/pavavuxorozejawiwedofovoz.pdfIn PDF document text
    • http://anpo.vn/upload/files/tanideneko.pdfIn PDF document text
    • http://maxbrio.kr/files/files/5562954030.pdfIn PDF document text
    • http://come2menorca.com/images/file/25319791291.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/64646434480.pdfIn PDF document text
    • http://sergeybazarov.ru/file/gamerolosuniwapetare.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/vozajaxofiwukebalopatez.pdfIn PDF document text
    • http://polipack.ru/content/file/wafaxajetumabepam.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/fewelipozifepawovef.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/cgq4fv10i4lk855odl7bp5akbe/92740051855.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/webaxojotomotasenu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=wrapped+up+in+you+watch+onlinePDF 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_off0000dd28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD28 18068 bytes
SHA-256: 9d2e8a71bb2023cde8ed00320e6be878955d5e0d0b124d293ee3c76ce11fd558
font_01_sfnt_off00010bda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F1 10736 bytes
SHA-256: e5350402a8631278c9bf4c42e999daf56b08bc3c2c0e118bc6ee057773354204

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