Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef622096dcf534e7…

MALICIOUS

PDF

84.9 KB Created: 2021-06-25 22:08:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0f04c7e0c90e2ed72f4d32b6c0dbcadb SHA-1: 7fec390f6ff0a535659aa4d23de48a2a5f513d16 SHA-256: ef622096dcf534e7383a3b6a5ee8aba7e31f9bb43736ff31722eb1638fe15580
156 Risk Score

Malware Insights

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

The PDF file contains a large number of links pointing to various websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The structure suggests a link farm designed to obscure the ultimate destination or to leverage SEO poisoning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/9b7d84c4a6b090ffcaa45215ed1ea1c9/vaxixifomapojabuwubitixe.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a30c83256bd---basofame.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a00223d5365---xesenum.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608386c362720---21503354662.pdf
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/likivuraf.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/4a824cacdcfd0db0b2d69e60f42cdf88/tagemiwemaruwel.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a461dc5f954---98218801692.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c92198cfc2e---gojofax.pdf
    • http://akgikorea.com/file_upload/fck_upfile/file/rerusalerinebavun.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/49e20dfc94323e0e0991ae00ad23fd19/84065857693.pdf
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0efa7f1bd---39887672061.pdf
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160bd18b6f18bf---jesukadebajutezusojam.pdf
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/daa0471d6aa32502a087178cb60e9fd7/44624976403.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/c637bd562839904fc361e19891b88f84/duvibenetul.pdf
    • https://ascinfratech.com/clientprojects/trading/file/zabatok.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8fad72d31---91415518887.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de454d093d---39155865939.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/manupovivone.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a64b733e8f---88512195505.pdf
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/tg565ltvod0198pvbul25v2t42/lemojuledagogajejat.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af2c13307cb---93004955386.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/6hro91e2k477c7s95blto79qko/xisoba.pdf
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073da9c7045b---44460086766.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803c5982254---juramox.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a11622048ab---51892496225.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=level+1+ultrasound+cost
    • 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_off0000ea6f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6F 16792 bytes
font_01_sfnt_off00010286.bin
0d7c2878d7da4c25a925d4730b993680a17cd1163e2f63df84fe3c1158a1134f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10286 10448 bytes
font_02_sfnt_off00011a73.bin
822601ebba1244f6d7c21ce65753f2e3a1b3bb7a7105fe693ecf7272ccb710a5
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A73 16840 bytes