Malicious PDF — malware analysis report

Static analysis result for SHA-256 b079734bb8fda290…

MALICIOUS

PDF

76.1 KB Created: 2021-06-13 19:51:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: ab3c818831e9a82fb634a83ec9c791c2 SHA-1: 8b84d585f5eaf0a061339b8b53dd40a21efcd24d SHA-256: b079734bb8fda29017df307e2cdf97904eee92904b7e5cf0b259818de86c38e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document body, though heavily obfuscated, contains strings related to 'Call of duty mod apk', suggesting a lure for users seeking game modifications. The numerous embedded URLs, many pointing to compromised WordPress sites, likely serve as download locations for malicious payloads or phishing pages. The presence of external URI links and link farms further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://crewmak.ru/uplcv?utm_term=call+of+duty+mod+apk+inewkhushi PDF link annotation
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2f6754174---82357833498.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/luxuvijise.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/m9c0lojgjcsu32474k1vorck80/jijapapamawukuramametix.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160727255aa245---77582838988.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/c1187f6c7a46b4099ee56d1d4f4cb251/setegi.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160783edfe9ba9---jufufide.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/foluvefigeberub.pdfIn PDF document text
    • http://allycatering.com/userfiles/19564812334.pdfIn PDF document text
    • http://atek-ent.com/upload/file/kodudizutelof.pdfIn PDF document text
    • http://kistours.hu/userfiles/file/20347435313.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b1830373a64---buluwanitavugefitovol.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/7091036797.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608768ea4ee71---82571382031.pdfIn PDF document text
    • http://askort.pl/Upload/file/92956245707.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/tn7aajvo2c1h7s1jtv6chnvnj0/31188722432.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/l4ttsemb6cvpv0e2d9ju850a75/23226797935.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE968 5348 bytes
SHA-256: 6c9a214b8d60cbb0eaca6df416dd57d1895656c5a4f04278cf5fc59fb4c6957f
font_01_sfnt_off0000fb93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB93 11608 bytes
SHA-256: ac2d5dccca5fe162813a69b05a0c03382f267e340759a929f04b0c3616273a0d