Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdde84e2ee1033fc…

MALICIOUS

PDF

82.8 KB Created: 2021-09-07 20:02:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0f3bf5eb19f21bd7bc080cd5d02504ae SHA-1: 370ba1022e83e5d4abfe11cd397db7c1fe3e86c8 SHA-256: fdde84e2ee1033fcfee00c454337bad71c5fc561934f109d01bc042fbb0384aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution attempt.

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 https://infrive.ru/uplcv?utm_term=scion+sq+gc-ms+manual PDF link annotation
    • http://cancercareresearch.com/userfiles/file/bijetofamaridutololewa.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0d3def656---wonolezupirofalu.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/161199cade0b07---kibikekezonibiguwazes.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/82468336770.pdfIn PDF document text
    • https://roarmysecurity.ro/mm/file/vabidisuparomono.pdfIn PDF document text
    • http://www.florentmaussion.net/userfiles/File/fupiso.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbfa1f5eb39---99862607576.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/lolezumudixikapesoripul.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/navojawosezorobipofosuv.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/vidugogabujofijowepetupu.pdfIn PDF document text
    • http://gpsputhuppally.com/userfiles/file/rogasabas.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606e32751d464---48224702245.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/69279598987.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7186c5266---69048930026.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d82a9596b---fakonu.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/pidokadevezetaxunibomo.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/jetirilad.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/kazaviros.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6059e738e---19411808157.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210608_582503C9C53A9806.pdfIn PDF document text
    • https://monyetmesum.com/contents//files/tisamo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ded0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E7 10596 bytes
SHA-256: fe1f9a4398d397e5816a91c78deed1720e12faf5a80f2c125d4e7bb2a2c842b3
font_02_sfnt_off00010ebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBE 18284 bytes
SHA-256: ee2fe18ef1aa29029654560d1c6abc4cccd6e916edaaf41ab96fdc37ee7a7fd3

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