Malicious PDF — malware analysis report

Static analysis result for SHA-256 950a4ea37169b24d…

MALICIOUS

PDF

85.3 KB Created: 2021-09-10 06:05:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7d53129d0d06c07cbdd34a99eaee31b8 SHA-1: 541724b685c2e8c1789625eaba93776e0b061c66 SHA-256: 950a4ea37169b24dbdd6862de35b49e4fb465881c5211678b090e460d22c89bf
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to compromised or disposable hosting. These links likely serve to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://dalton-english.com/userfiles/file/didirejetisuf.pdf In PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/tojesujajoloxenadiko.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/nikidelazasenisoxupav.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/dolunufaze.pdfIn PDF document text
    • http://air-ned.com/uploads/files/loditonagagik.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ae76b7b36---renileloz.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/75ad08a5f44c5f8d6a8b10cfa4b74444/61391269385.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/tawemejalujaxoxokebizoxap.pdfIn PDF document text
    • http://sibmaxi.ru/userfiles/file/xaxojigukibarus.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/92145217693.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/rofadaxisojonojimoxal.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/5vj2uqj87adfnvbtvbb2deevp2/13366659492.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16136b8847592b---45945049656.pdfIn PDF document text
    • https://kvizek.hu/ckfinder/userfiles/files/81081428385.pdfIn PDF document text
    • https://faguaflowers.com/images/admin/file/14642750574.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/22378902084.pdfIn PDF document text
    • https://j26clean.com/upload/files/26503290901.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/wewedikogoxitipivejubexob.pdfIn PDF document text
    • https://iphone-odklep.si/vsebina/vumetefaparisugozizosok.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210903043245.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/pirejezazexewaba.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/897c2924fe7d0870f7fa823459532ef9/xobidurapesoto.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/6f0bd25f495e09d54865177f3acd01c3/10301698078.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=funkbox+app+androidPDF 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_off0000e999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE999 18056 bytes
SHA-256: 010ab80c89b9d2f81fb225132c79c52ac118ba9b4ffcc9fa460822b1dbca5173
font_01_sfnt_off00011879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11879 10352 bytes
SHA-256: ba70f929ab916d651563a0665e9f8aebd40235c36afad56e0f4555400a2efd24
font_02_sfnt_off00012fa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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