Malicious PDF — malware analysis report

Static analysis result for SHA-256 87e9865f04939348…

MALICIOUS

PDF

92.3 KB Created: 2021-06-28 22:56:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 033633e4a46482e74c4168852429d9ec SHA-1: 120934002b78d699e58d7eb67c55f9a977888272 SHA-256: 87e9865f0493934878912cfb30f2965a3b9ecfedf87975afe858329f77bbb443
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of embedded URLs, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://oniceh.ru/uplcv?utm_term=tracking+pollution+a+hazardous+whodunit+answers PDF link annotation
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160727a81a354a---82687754109.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/15899215544.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/hu7ube10pl4rcr1oamqf7mcqud/jubilagimufozu.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/40049b08f65381cb92aa3e98db183181/gobexuxelisawedubepu.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/95168857655.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c12bad87aa8---41982622597.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607cab9a7914c---30117372310.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609568e44026c---gawazavudafesi.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/vjpqvnq9ult76ke1li569msugn/gobar.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/wasozosiko.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/16323166018.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/e26e73372fe82491a50449b8c786c501/dasukajusudiwovenejuwovew.pdfIn PDF document text
    • https://twfern.org/upload/ckfinder_temp/files/20210531193313.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/3784ae1984902a878c9189f0682f9899/83786719875.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/zadekeforiwimefanuvib.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/ff26f13234329a45e6dd13fb27f62001/12467258409.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/31a1627caf7b19f5c1771d9199da18f2/lirutuwoje.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/91984135968.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/b531612911d3983c90a0788f6842706a/65547124311.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/guler.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608820b4232ff---41868319332.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a9c9085ab---xoligixinugalinuxutuwaj.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE908 18976 bytes
SHA-256: 5ea7dda003f9433aaa1a97ed4e282b751dc62582f83e6c927b8fa9d9f0192413
font_01_sfnt_off00011a3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3A 11092 bytes
SHA-256: 6c9b826ebfa436ca3c31681023f30f2cfaa44da99e4ff647755e38a89ed6428c
font_02_sfnt_off000133f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133F3 16104 bytes
SHA-256: f06cddf61c9925e39e47a8b8d88d5d2c108808d867bf63b528aab798a6fb49b7
font_03_sfnt_off00014949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14949 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1