Malicious PDF — malware analysis report

Static analysis result for SHA-256 0234872728d33787…

MALICIOUS

PDF

94.1 KB Created: 2021-06-28 13:56:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f15802ac9901853a277c89b3c7e2fe04 SHA-1: 3ed2ac9b3ce5ab03964ab6158e7b7f8badf2dbc9 SHA-256: 0234872728d337877870ddc14e4d807b864811ee5424d6ed213fcef1a3035517
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be compromised CMS upload storage, as indicated by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV also flagged this file as malicious, specifically as a phishing trojan. The primary attack pattern involves luring users to these external sites, which are likely used to host malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa321a4a701---gevokenanugazexula.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b56ea55f3c---kadorikeja.pdf
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/l96su0nu4p0nir1cm7htjeheb6/34472534431.pdf
    • https://mabuksusu.com/contents//files/34852222251.pdf
    • http://kstarsmall.net/userfiles/file///woxofomotizanumimufowurek.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc7611f245---bonujubenevimomejejiguf.pdf
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/mebajofugiteduteduka.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a661066259c---52573414768.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16090c00695642---1520978159.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a939512ceb---76658236060.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d93ed569610---tofatajimididofej.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073cc3379473---31290904993.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/f78aa64c68535a6370742fbca11d4acb/donafutovonajijofolido.pdf
    • http://centromp.it/userfiles/files/65210244509.pdf
    • http://jikaramen.com/uploads/files/15462040647.pdf
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/843a73ba2058ff3ddd8467d17ddcb9c1/fipuxixav.pdf
    • http://dfwsedan.com/nbloom/fckuploads/file/fofit.pdf
    • http://nextgenship.net/upload/file/20210623162441260674.pdf
    • https://accuratesearch.com/userfiles/file/divixinerewira.pdf
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/a77210dccba063388d451ad6795ecda7/gowaperav.pdf
    • http://arslanemlak.come/file/83641788824.pdf
    • https://aawyx.com/sites/default/imageuser/file/19886798842.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8067d0027d---5638892314.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/b0c63cdca2f926c954904ba1e1071876/34918170911.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=creative+writing+article+example
    • 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_off000109b0.bin
374d1034a21227d16917909fe5fc1540eb4e7fe4b3c0187b10140ad9dbe08604
pdf-font-stream PDF embedded font (sfnt) at offset 0x109B0 18096 bytes
font_01_sfnt_off000138ca.bin
7bd816716b4f7da5253b456a2c76bbf5e569c58c1908f2e7944f20ea2a278e75
pdf-font-stream PDF embedded font (sfnt) at offset 0x138CA 10712 bytes
font_02_sfnt_off00015170.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15170 16792 bytes