Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab43f96f344f6238…

MALICIOUS

PDF

85.4 KB Created: 2021-07-18 13:28:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 229c71d8b970334f1db170ef86d64b35 SHA-1: 3609b32d2cc05e04dbda51c5dc9e3399e5729771 SHA-256: ab43f96f344f62384f1c8d344d56a4c303b248aa85a1e8ca19db63393e5decf0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c027db06e70---xaporegajexupopu.pdf In PDF document text
    • http://chixue.com/uploadfile/file/20210628030819.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/fg1i70t6orgt4n3uvogspcokru/luxujajal.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce9766b99f---29727611875.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/96382846838.pdfIn PDF document text
    • http://hilltop1976.com/clients/24685/File/xaxubi.pdfIn PDF document text
    • http://alkanboya.com/files/file///87609539053.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/domopapamofuv.pdfIn PDF document text
    • https://samoinstitute.mn/uploads/assets/file/xajaxakisuneluludev.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/62943313451.pdfIn PDF document text
    • http://cissi.it/userfiles/files/manukunewijapoxodazerob.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/tixonenisadusidunavawazuw.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaaff29125b---91296246019.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a167af8a90a---jakukemenozu.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/17387213889.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/60632499555.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/1f3d3ee357282b645839318c3d8fb61d/nosasu.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/raa2bd2mvjon0drubt3hp03c35/61944808902.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160e8b14b2b90a---kenalipux.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/dixonapuginomomebi.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/femolemazurasinigisiwes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=2014+ap+calculus+ab+free+response+answersPDF 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_off0000e729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE729 10884 bytes
SHA-256: 300134f80b11382efb5efe1942976dd76fa943a588ab0762dcba9788d1412eb0
font_01_sfnt_off00010075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10075 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11887 17560 bytes
SHA-256: 5f58b804a4d202328733ab670a91a72e91f7dcf3d6a681e8031cae8f6e85b542

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