Malicious PDF — malware analysis report

Static analysis result for SHA-256 c18dd4c6882ffc41…

MALICIOUS

PDF

83.7 KB Created: 2021-07-01 20:37:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c1b939ad09fa0f7b74fab985099e9bc0 SHA-1: f3b1bf7cb5722fe3cf3fa31e074ffe36694f2621 SHA-256: c18dd4c6882ffc411ad975c5a2dab1128ec028d8e963fae5d7b1993c4537d89f
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics reveal it functions as a link farm, directing users to compromised WordPress sites and other disposable hosting domains. These links likely serve as a lure for phishing or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd6ec4d2e8f---16244107178.pdf
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/xegepalo.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c96aab64ac0---fefubajuvivojito.pdf
    • http://esistore.be/userfiles/file/37643928349.pdf
    • https://akproauto.com/nbloom/fckuploads/file/zukajemuwubu.pdf
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/cb719143d1b5522a41a66ff178d6f2f7/40780678212.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bda7324bf93---fibapubaneruvenamuwapaga.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16073c53d0f685---vusixijo.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/2a7s2m0s2crv8ab8ad3b51n8f1/36418125023.pdf
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/8b0848be0ea904578394e5ef7b515e21/ledezowurelefapetuma.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2d5c73efa---47368512831.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/c2aikhq80112gi1vagbpgfs74e/wiwasumovimunamu.pdf
    • https://bruceautoservice.com/files/file/gokitixasawojumo.pdf
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/d45be0eaba0de929e05f6eaea55b0e18/61137485262.pdf
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/da6531593896f35de5a6a51fe72912ea/dokedorogapebatovekab.pdf
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ce058152132---62654469023.pdf
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/bhc8qi1ke1kjp4tmufa5ovn4i6/vetariwemapixofu.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092da370d2b4---nibejuniwewukibowud.pdf
    • http://agataklimowska.pl/userfiles/file/dakarinovivonagoluxa.pdf
    • http://charivne.info/images/file/tenigemabatukosak.pdf
    • http://cgpreceptor.com/ckfinder/userfiles/files/regaxerexerafeliwu.pdf
    • https://akapacha.com/userfiles/file/towobirekulubud.pdf
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/aca281a1226bc5820c0ca5905ee51883/juvovima.pdf
    • http://kientrucnhacuagio.com/upload/files/kuxariwelesej.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=make+sentences+with+comparative+adjectives
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e32a.bin
d28b6831bfad4bd2822260388a4484281f11c5987925f3b168deae257d08a879		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE32A 16964 bytes
font_01_sfnt_off00010f65.bin
0db884e5814319435b71b477bee924ff57685d02059f0469b0beca2b6c1fef3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F65 11100 bytes
font_02_sfnt_off0001292c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1292C 16792 bytes

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