Malicious PDF — malware analysis report

Static analysis result for SHA-256 783453b77f371464…

MALICIOUS

PDF

80.2 KB Created: 2021-09-05 22:11:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2a2fbf06fa11645356854874535ec1aa SHA-1: 2f4964d56274ee9af8c1d077e3e01e7d9d5f125a SHA-256: 783453b77f3714647707a9797b93f7c357462d3a725c573e7ac2e0de33d36c4f
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to various domains, many of which are hosted on compromised CMS upload storage or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://tea-ra.com/user_data/upload/save_image/files/nawazasaxuzedivuretofanu.pdf In PDF document text
    • http://mygiftltd.com/userfiles/file/xefovo.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/50c67b7bfd9b2104f175651b9603700f/risatufifanowivu.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/28feac5c8afe6f9ee356f20591c0d3a9/39140219633.pdfIn PDF document text
    • http://bogieclassof67.com/clients/71235/File/97132979510.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/gozisenekixabamejufu.pdfIn PDF document text
    • https://monyetmesum.com/contents//files/kodolatotonu.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/g4jopntoqjpohe6tq817l2rn07/ripakunefasosibuwedugovex.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5fb42efad0---tumeziwojutexovexexarusu.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/96524919848.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/34643510378.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/pepokufegedesofudimor.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/difozimimokesifipolinasu.pdfIn PDF document text
    • http://inistor.com/ufiles/files/deniloxodimorikibal.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fe5ba29d6510471bf217a4eb8e2dfc64/75953998524.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/4en13k5sedium06vd58jjbv3od/gumoxigaziru.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af93af9ea08---60119474043.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16070038f7a764---85800152662.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/44160243340.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/64740524866.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/71956448331.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/firilulepunodesalorot.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae621ea2dba---lujilig.pdfIn PDF document text
    • https://jamurgoreng.net/contents//files/sevagakuwopemawewabiruf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=without+you+the+tragic+story+of+badfinger+pdfPDF 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_off0000d225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD225 18340 bytes
SHA-256: 1418f273896780d9b2087c67e88b76d0b31331831e23d2a77966fb9146e4092c
font_01_sfnt_off00010141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10141 11200 bytes
SHA-256: 1a72fccabb3118aebd10e7e9e80b1925c1819a8d3f7fbc4610ee749721c71587
font_02_sfnt_off00011b12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1