Malicious PDF — malware analysis report

Static analysis result for SHA-256 f86385a50b3f0456…

MALICIOUS

PDF

78.8 KB Created: 2021-07-04 22:56:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 668de0449f2f93af9d0beb4ef0511945 SHA-1: b451457550014db9cf066455f1d986a69808e491 SHA-256: f86385a50b3f04565b9bcf2647d8c27b67eb90bd513676ac8d5bb1fb3936fbe2
184 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. The heuristics indicate the PDF contains a link farm pointing to compromised WordPress upload storage and uses a 'download button' lure. The presence of a callback lure suggests a phishing or tech-support scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/4ff4e2499f0bc2c09b163b7bbc2b8586/79049539066.pdf
    • https://zlato-eu.sk/upload/files/21848793721.pdf
    • https://cottingham-group.com/cufiles/files/41113066455.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/6c3f0d74e880215a493de1a01133d121/rebosupijilexumanigata.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/e92e478f5f18833188f48b15d4190aeb/bewozopomabogos.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160912779ad21d---vojegilog.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dccbd7319b7---43431505194.pdf
    • http://supermarketdv.ru/files/file/77160077402.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/u38saph63ljqblsf1hpr77fbal/pokazumigotokikosit.pdf
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/cdqsk5s2lknfo4tbf4lrreuk8j/96101119263.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be6ba51fa62---losupajuzamofewegelusode.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160799aa7eb1f2---38393507982.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cad72ccae4---luwuved.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c965fcb24f5---76178517543.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/b8dm7383o4h26ur5phhrp6cmt2/97780572986.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c48198e2c23---zokikurozuranitowagevoxo.pdf
    • http://www.ecvbrass.ch/user/web/file/lofiboka.pdf
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/eb5ebc0qc301m5chc07fsjb4q3/28410195493.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/a730a8e6da8ff475d0c2e86a44c931df/88762331675.pdf
    • http://drironcat.com/images/file/45908330186.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce96d253b2---zunulisugal.pdf
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9233d04e9---35335592456.pdf
    • http://akcjonariusz.com/UserFiles/file/21542596547.pdf
    • http://skrabl.pl/www/rpbd/fck/file/motelu.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609a639d7be10---41625796182.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=cost+to+change+address+on+license
    • 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_off0000d1fb.bin
dddef16e56e9a87c55aca0f79e5d436d14280cc27b0a784a8a2c4fc3d1550390
pdf-font-stream PDF embedded font (sfnt) at offset 0xD1FB 16744 bytes
font_01_sfnt_off0000fdd2.bin
fd9d47a6a12d7932bb6ede12ecc3a80d8f7b7dd2167a9ae01cc6688154453755
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD2 10680 bytes
font_02_sfnt_off0001160f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1160F 16792 bytes