Malicious PDF — malware analysis report

Static analysis result for SHA-256 60cb100fb185f283…

MALICIOUS

PDF

75.9 KB Created: 2021-09-11 22:50:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 361e8e210173f126125eb3664e8e8310 SHA-1: 406a1fc80b15d4079563f0b505481025e013a877 SHA-256: 60cb100fb185f2834277d863b263d4eb074b767156ba53cbcde96393c7a005e5
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV both strongly indicate maliciousness, with ClamAV identifying it as a phishing trojan. The presence of a link farm on compromised hosting suggests an attempt to manipulate search engine results or distribute malicious payloads indirectly.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://allytemp.ru/uplcv?utm_term=how+to+change+action+bar+text+color+in+android PDF link annotation
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137764a410a5---waronusujel.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d8ef5d4fb---33836560488.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/10c8e03cdef73374eaa36e79e998fe6e/bewanugelu.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161304d5c458db---72131267879.pdfIn PDF document text
    • https://bimore.vn/webroot/img/files/32251735624.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/28477996192.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/ginezunimagodipebigow.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/jivuj.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/uh9v7sjkt8ej48tutd4qaosf8d/subenasurijo.pdfIn PDF document text
    • https://rusepress.com/uploads/wysiwyg/files/zugaroz.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/komugufiwogadujawova.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/pulifadetamidaluvezukixa.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/kovimazutulubuxurume.pdfIn PDF document text
    • http://hagakure.by/upload/editor/files/zofidagituwodudum.pdfIn PDF document text
    • http://lex.tj/img/file/4770975755.pdfIn PDF document text
    • https://securitydm.eu/slicice/file/tesomojidijora.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/bejat.pdfIn PDF document text
    • http://condosworld.com/abisol1/userfiles/files/wewipezeras.pdfIn PDF document text
    • https://nurdagihaber.com/resimler/files/miluzadikijoxopo.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/vogetinubanuzonig.pdfIn PDF document text
    • http://essentielles-theater.de/UserFiles/File/rojonatagoxosopotekare.pdfIn PDF document text
    • https://lordoptika.hu/files/files/dasinonivowom.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/sujilolikafatatepapotatem.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/kibike.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_off0000bfbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFBC 18552 bytes
SHA-256: ee245dc17060ad5a6259d6c752566311fc3db30fec057942dc3fc5d76ff1c50a
font_01_sfnt_off0000f0ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E1 10800 bytes
SHA-256: cb1321c42ecc30f86416b623a04b2fe1703eaa39c9820985f9ec21e09045622f

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