Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ab88df356530770…

MALICIOUS

PDF

80.0 KB Created: 2021-06-27 06:10:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 01063b61b135798dd905d7cd7b5c5145 SHA-1: ddfcfc5af7599dc86de922b93e9818a368cf74d5 SHA-256: 2ab88df3565307702a9d92aaca0e744d6a400e192a7cc077144d4ef733e13932
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised WordPress sites and disposable domains, suggesting an attempt to lure users to malicious content. The presence of external URIs and link farm heuristics strongly indicates a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9813

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://coretry.ru/uplcv?utm_term=numerical+methods+for+engineers+by+steven+c+chapra+pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/80d719b7c6023cc27e0710fe966425d5/jabexugitokofugikumem.pdf
    • https://gencerenerji.com/resimler/files/31797503126.pdf
    • http://www.alexgis.com/siteuploads/editorimg/file/libuzimewozori.pdf
    • http://dalaichau.com/files/gebuzoko.pdf
    • http://thepokewave.com/uploads/files/wixexefurovikateme.pdf
    • http://altinay-law.com/images/file/2096174203.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/d35ed6f763365d2b7e6aa741e91c38ac/wapadofak.pdf
    • http://daoltrading.com/userData/board/file/17134402769.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16082817eabbd5---3089131498.pdf
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb754cb331e---juzefafetoluxaveg.pdf
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/d9b6910d1178e58b10a54da6ec551a2b/mekizubit.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b6017b002d3---6841748963.pdf
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/5156f86a93966aab5af2f89afc9da098/gatagopafa.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9fd158a16---zuwegejibasotixukemapipox.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608045b41426a---37891620544.pdf
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/ptu008tkcjcut1b3jjhqsv1shn/59422641306.pdf
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/646ab27372633c4be0a233e120d29cc3/paxajin.pdf
    • https://jodhpurtravels.com/nbloom/fckuploads/file/mavagug.pdf
    • http://coreaad.com/DreamDataUpload/file/pitapojadixupuxizowo.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/c7b7c3bdee82f812a3ce9fb779dbe759/lutigojisasenexe.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f233ab6508---17620245549.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b0acac093---xamalibuvozunajasazet.pdf
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/67tajl7j43j38ver8hk4l8059l/zokuxeberodazosexejulewu.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16073a27263848---farazulimidez.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf94c79a94a---vezidezokowida.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/64ae392800f95f85b353264aeb2e6357/xuvelutisobesato.pdf
    • 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_off0000d351.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD351 16792 bytes
font_01_sfnt_off0000eb63.bin
f8705a9d515d059eb9be301d90beb6950c74f158d100554affd17354c85e503d
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB63 16964 bytes
font_02_sfnt_off00011781.bin
53c22766409d2c04a087080e32cf929150d2728eeb5f385defac9300aeffe72a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11781 11464 bytes