Malicious PDF — malware analysis report

Static analysis result for SHA-256 778e81f6d6444633…

MALICIOUS

PDF

74.9 KB Created: 2021-09-07 06:37:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9f650c43f8720dbcb501d46acf407920 SHA-1: d77b0a9147a1613325789d247fc16b1501d6a4d3 SHA-256: 778e81f6d64446339abe3dc3615ececa58c297db17be6bff952b87ac1e109ff5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains a link farm pointing to various domains, some of which appear to be compromised or disposable hosting, suggesting an attempt to distribute malicious content or phish users. The primary attack pattern involves using a seemingly legitimate document to trick users into visiting malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.terraton.com.my/ckfinder/userfiles/files/96201893125.pdf In PDF document text
    • http://fundacionecla.org/resources/original/file/68667941013.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/67718428725.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/befiromivikewiti.pdfIn PDF document text
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/34169223284.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160827b8f7e0d3---91793731980.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c6545eda4---wuxufojovosadej.pdfIn PDF document text
    • http://domosplast.hu/files/file/21605134515.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c69dcd3a7---35192837486.pdfIn PDF document text
    • http://vncanada.vn/uploads/files/nimadixanelipav.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/wuxefuxanijijunusumar.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/9a271edf7d891b7de6aeeecf887fb06e/47096231463.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a28a954a1---14684309985.pdfIn PDF document text
    • http://poiskvod.ru/images/file/saponowagejotiluzene.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c98a05469b0---tigijurenekozerazozalusa.pdfIn PDF document text
    • http://mosjob.ru/images/file/95083122697.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c78a958e3c2---32542037013.pdfIn PDF document text
    • http://polkovnik.su/upload/file/78053583500.pdfIn PDF document text
    • https://ebdaatcoop.com/userfiles/files/7891834329.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/72362950385.pdfIn PDF document text
    • https://xn----7sbeo1acdy3adh.xn--p1ai/userfiles/file/tunam.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f66168465d---81109519865.pdfIn PDF document text
    • http://donaldbermanmaimonidesgolf2020.com/clients/0/0d/0d43fbb8ff91cab41fa1b056c0d912a9/File/kaxej.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/duretasukigosakevikek.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/650163681e647268f9d0afe2b83afb37/65456984740.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=pattern+recognition+and+machine+learning+bishop+pdf+free+downloadPDF 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_off0000bcd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4ED 11292 bytes
SHA-256: 4a5badbd9fab0598ed035fbb43cf88f7709c506f46657656f26a201e8c8589c1
font_02_sfnt_off0000eed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED7 17780 bytes
SHA-256: f4946e4ae75f8041cdf381294295c24dab6841c469e90ea8a3bd9fb213aa68d7