Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc8db0239f409301…

MALICIOUS

PDF

86.8 KB Created: 2021-07-24 11:57:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 78e05d31155bfecc01d153e7751abe53 SHA-1: f4cca785033ae80b798a9f55e57c0691514a0c4a SHA-256: dc8db0239f409301216cb99ba3dcf09e6319412fdcdb5a44dceaafcd6637f5b8
164 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous links, many hosted on compromised WordPress sites, which likely serve as lures to download further malicious content. The presence of a 'download button' heuristic further supports the phishing and download lure aspect of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/58b1a859da4d6385093648884787327e/sofakuvuxadipalabod.pdf In PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9cf55d1eb7c3dead2646c55a3900292d/44061314955.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/rafanuv.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/855b765efed724de6f873e9dfd93e6ae/57197124153.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/larojatelitetiragimed.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/95432174430.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/baxigamatuwivus.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160784e6f89a62---9886445250.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/g2q6t3q2m56vfgfq3t9gmdi3sm/wuvomogorupunuzojokolo.pdfIn PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210704_045E6A451A9871F8.pdfIn PDF document text
    • http://artospace.com/pics/file/11705601866.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1609472f1e2ce6---nuwakalupomonezatapad.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/6836787535.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/5985662224.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16081323b80052---notejojujulopigoru.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/35715968039.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/3299298974.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/3e99b423194365d2f9397b5f33f51956/zuvanozuzezisinoj.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/xotegatezane.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a0b6c1715---97499707545.pdfIn PDF document text
    • https://willmarlakesarea2040.com/ckfinder/userfiles/files/9157484279.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609bde8217dc2---25364876420.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/9413088097.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/8q0le13b4k6mmj84o27oveiv05/visudodonazobanevabej.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/ms09np5nlrbqg7pa82j444vdbs/nugazasaw.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7cb2235aa---mavetexelepobonol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=active+listening+1+answer+keyPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF192 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A4 16604 bytes
SHA-256: 1baa65b275f59ce6be77463c3e6e34eb221cab524b1dd6ef899c0e86c39ee73c
font_02_sfnt_off000134cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134CC 10676 bytes
SHA-256: 31bfb4ffa03c1e71f0cd34161f02c8cc6392283e6d0502deef7b901af128e6d4