Malicious PDF — malware analysis report

Static analysis result for SHA-256 11328a5035ba7a50…

MALICIOUS

PDF

86.1 KB Created: 2021-06-28 16:52:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 57f263f9d718e61b261fd6e34697838b SHA-1: e9703e6404e50e64c71b2c6d4835892783c30a51 SHA-256: 11328a5035ba7a505a28975504e3fa16f739c898f5c35155d98dcff4cae5a597
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites and are structured as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs suggest an attempt to lure users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://chupanhnoithat.vn/upload/files/46897323588.pdf In PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd65856915---56586314069.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/wematumiwufuxazawuful.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/efdbb99eee882f881fc38ced9a711bd2/45518117924.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1d2b67207---pulotizogop.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16079920e492f1---30011063734.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/itth2kidee3jt7bo2d1vg7md81/kosuzuvilagosojorab.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/a89c60328b000e0ff8f0a85e4074823f/25657313459.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6dbd370f4c---bimuregijoporotoxipevox.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/60896675113.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/zukuwisuwizopudupubuzik.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/62978253515.pdfIn PDF document text
    • https://serka.com/serka/upload/files/pufowakovuboluforitiv.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/5fa6335742dae5440021ef4b14c219e7/31197124468.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/fibawuxipavugo.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/51703276452.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/gebusuxezinikidedoreguxuv.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/558bf9bab92d2b54d46ff9529b8cf2da/vudog.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/37423737257.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/93284850692.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/baa5d9f16dc63d91c4262280faefbde4/jogopinamibab.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce6c6374244---67761935882.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/95718394961.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/87311183026.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=perceive+crossword+clue+5+lettersPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD719 17420 bytes
SHA-256: 27a37eedb89b55acd9185a99881c8cf16b6737d60ca5b1bb7b5f8a1ac1796b74
font_01_sfnt_off000104af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AF 16180 bytes
SHA-256: 890fbedf969ded8bf4768764711ce6128b86a33e3263eb8223778476ec57582e
font_02_sfnt_off00011a60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A60 10484 bytes
SHA-256: 12c6fa7486556aedbebd3baa06b4210491584a64752a40ea7515d7d98e835623
font_03_sfnt_off00013272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13272 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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