Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4e7447fd68cd2bf…

MALICIOUS

PDF

96.9 KB Created: 2021-07-24 19:25:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b39809053936527742b630e1ca482bc3 SHA-1: 972f9718eb5c732878df56f00172d540c36f9b8c SHA-256: a4e7447fd68cd2bfe5fa0bdbd14c8ee2200f464e3ace3c507ac834943da6703a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with attempts to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://cosmickino.ru/sadm_files/posiwewifutovuzukonerawok.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609613f0a9793---lorazefin.pdf
    • https://vigiweb.cl/dinamicos/files/file/32348283302.pdf
    • http://amexeuro.com/an3_Uploads/file/1284625167.pdf
    • https://betalinktech.com/blmedia/file/lurabazisorized.pdf
    • https://csodamalom.hu/files/files/45248285145.pdf
    • http://www.findvoters.com/userfiles/file/55918454294.pdf
    • https://toppelletmachine.com/d/files/24487624808.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ca1a7efdc---wufeterufalu.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/0be8a9221bd405226e97baef3f13b473/koserujoketozukafowoze.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/aa4217d3fc7d7ffc11d524ea1acf0325/84508082616.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160897dd96421f---xewopuzug.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608087ea18f05---tidepozutamusulamez.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbc096e7ed---wuzalilakumozod.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/7e6553121883dc51c88785818bd95627/5044500444.pdf
    • http://veoguidecostarica.com/ci/userfiles/files/65857835749.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608100b32aa48---77563772574.pdf
    • http://southfieldhigh1973.com/clients/2/27/27a5067865c8334ad4a5a1fd7642c928/File/gonuwome.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe7da601ae---21891498565.pdf
    • https://kclandscapes.com/ckfinder/triplebuserfiles/file/gozeregulu.pdf
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/9452d13837cfde244e3318b3907c60ec/21096877461.pdf
    • http://www.dilipprabhavalkar.com/images/file/53944230354.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+set+up+imden+bluetooth+fm+transmitter
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6f1.bin
9cba72d373ed391f83745dc018b478f84dc33a9a7ef5668f83b2448f08ab5fac
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F1 11080 bytes
font_01_sfnt_off00011052.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11052 16792 bytes
font_02_sfnt_off00012863.bin
00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
pdf-font-stream PDF embedded font (sfnt) at offset 0x12863 16140 bytes
font_03_sfnt_off00013dd6.bin
de2e555c917916214aadec8c7fe7774a09ea587459ebeb69b3adaf7325d4afe1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13DD6 1856 bytes
font_04_sfnt_off00014681.bin
f629793ee54cca958c47745bd11acf37a31db316954d85ba9d3b88204ff62f0a
pdf-font-stream PDF embedded font (sfnt) at offset 0x14681 17724 bytes