Malicious PDF — malware analysis report

Static analysis result for SHA-256 1191f81052806793…

MALICIOUS

PDF

83.7 KB Created: 2021-06-26 18:02:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0998e7f9750a7a0ca1542391ba0ffdcb SHA-1: 05f18382a54a89eb370326ae00a4b47dd4c7f63f SHA-256: 1191f810528067935aebebecd38c89255f54dfd4ae7182e864278980746da192
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The presence of external URIs and link farms suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://cructi.ru/uplcv?utm_term=pirates+of+the+caribbean+3+stream
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b83c6745b53---80157724853.pdf
    • http://www.serenissimaservizi.com//files/12013193411.pdf
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/dfc46338593c106b32aa98048d2442ff/64899265635.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/3669549912cdfb66336e43949be6dd09/94930504531.pdf
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/9cb7ae74c7fd3fbf1d7428081b4d283a/46937769812.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee4052fb38---lunukajakimemezawarabuja.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608a829c22e6c---ditalerazifamav.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/be13401dad53abff3ba7d346223aa693/96189953430.pdf
    • https://jamisonfurnace.ca/userfiles/files/moxuratibonavuxofimidip.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f62cbdfb16---woweliden.pdf
    • http://tamker.hu/userfiles/file/xuzepaxoguzabi.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/a9mr9l30ielio4v01j621ibrp4/vepomobovozuja.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c4deba1fa---80793279236.pdf
    • https://topclassgreenery.nl/images/file/fajetanur.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160955a1e3184d---10675313839.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/36d3fcfa8fea015a4bba177779a4c503/30693377405.pdf
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/c7e3778f8592733585532540919a3b04/webuwup.pdf
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16085867ec3882---94782985697.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/c5f8d70060f8a42d44b112f0b351b3a2/72529338497.pdf
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/18f82c10714c13f83c97385538289aff/69622702922.pdf
    • http://zh-huaxun.com/uploadfiles/files/24378810530.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160725b2194eef---34505242850.pdf
    • http://kursadowicz.pl/Upload/file/9204989115.pdf
    • 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_off0000e047.bin
a4874d49f844beb4cd9386cf04d18b9fb845926eafeb2f16d908fd67f032d34c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE047 10868 bytes
font_01_sfnt_off0000f93b.bin
fb25e4ad910696f30568a9a20ed2ab45de92b50dfa9ded1c9e719ccc357daa82
pdf-font-stream PDF embedded font (sfnt) at offset 0xF93B 18516 bytes
font_02_sfnt_off00012947.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12947 16792 bytes