Malicious PDF — malware analysis report

Static analysis result for SHA-256 7236a3ad358153cb…

MALICIOUS

PDF

82.3 KB Created: 2021-09-03 15:15:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 55a6650b39a992e9ee88b88e987ec79a SHA-1: 7f2e23ca7806d3f5b2791c93940b6c60c9756560 SHA-256: 7236a3ad358153cb57fa7997a698109895fb9ea1c02cd704ec11825fb896b894
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, so the primary attack vector appears to be the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://synerhu.ru/uplcv?utm_term=simplex+4001+fire+alarm+panel+manual PDF link annotation
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d4b5f5d097---bexanajopikoziza.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/runakelet.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160714da92b8e2---botudori.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/levitabokokuzalexin.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/72510947397.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8cd1ca968---masepa.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/lonuzulalizejujeg.pdfIn PDF document text
    • http://manhchenang.vn/webroot/img/files/jimewazexoburonudabebowuv.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608963b2af7ee---nepuwotabulosefibolifozi.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/c808b7784f14dc4fa5d73ea179e70bda/37658845826.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16085343d66d2b---34314174879.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e95c0abba26---70161045547.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/cb1811f7caa470b5f5a95997edde0ecc/sujisisekojafupari.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6b1d5b8d8---48394297291.pdfIn PDF document text
    • https://hgb.se/filer/file/14222422725.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16092da89e510f---93158557355.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/6730321342.pdfIn PDF document text
    • http://sartoriaventurini.com/userfiles/files/38842087396.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098359160352---zepegonufebo.pdfIn PDF document text
    • http://stylowa-pss.pl/userfiles/file/ruselekimajupomum.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/lrmik1j2jvikkiifumj753pofe/jasopakoli.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/tanuzamabo.pdfIn PDF document text
    • http://totoquynhhuong.com/upload/files/89139529168.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609af62d62d03---vifipelumu.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fef5b43b2a---50481588080.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/sejukikekamig.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16093b7e42656e---kexizujemijufagupemutaf.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_off0000dc8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8C 17208 bytes
SHA-256: d5a148d191877eacd88302cbb48949d2ac1562d33f97eae7da62934de062f653
font_01_sfnt_off0001093d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12154 10660 bytes
SHA-256: 66607000c97849f3e8739888d934837d3848068c0cfbe70c931960783f17c639

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