Malicious PDF — malware analysis report

Static analysis result for SHA-256 99b78704f250b26c…

MALICIOUS

PDF

132.1 KB Created: 2021-08-09 21:48:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 032b0b382cb37f70672f1deb80c7c003 SHA-1: 811aed45f92cdb028c4ffa769e7b14a76958f633 SHA-256: 99b78704f250b26c2d9aeee42aede61d2215f62784540a32158d7024c4685d3d
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to host malicious content or phishing pages. The presence of numerous links on disposable hosting further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607651ae08d80---jekimeribolurawoturujixif.pdf In PDF document text
    • https://www.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/49375730598.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/52331448870.pdfIn PDF document text
    • https://www.avantagesapp.com/uploads/files/77844793150.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/dp02brm7i7evjfspvh34src5d0/gozesesenoluxegetafapo.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/gopubowuguviliga.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6405278078---67975893071.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/33ed8b82454f7cf2919680a4d39d2a68/kewemijoruzir.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/rcblhlsomeg46rpabkb5euur1o/sekitusazomajodudatof.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/32949433249.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/5876699722.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607424cacf6f2---sojebutizofulinukuli.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///zefepebikila.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160d1907f0773a---16160762073.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/f7ba9d9ed722d5cc50c280b506ef3607/19956516680.pdfIn PDF document text
    • http://abnicum.com/files/file/lofadekepobewifoje.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf93fd88c1---2758732018.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/63986832181.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097f929d076d---xepelulevesa.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/74356792191.pdfIn PDF document text
    • http://redfordunion70.com/clients/869360/File/6001286055.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160781d4c0361b---84513685756.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=agile+scrum+master+study+materialPDF 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_off00019ffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19FFE 10684 bytes
SHA-256: a30f4379fe20516b112f9b8ec0079760990177a7001ca6227352576f671c17ee
font_01_sfnt_off0001b85f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B85F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001d071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D071 18848 bytes
SHA-256: d2768306523c11ddcdb1db0747282d8235142b35ca65a6e61d3eeb7a85609b16