Malicious PDF — malware analysis report

Static analysis result for SHA-256 a600ccab105e925e…

MALICIOUS

PDF

89.4 KB Created: 2021-09-05 17:23:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f67dc8bd321f36d9be3511b2366796a4 SHA-1: b77bbb097866c0ce0d92a59232f251a0ec428b48 SHA-256: a600ccab105e925e0e64772dc4f8fc89c4c6faf4081b703b4659bb59a0143f6b
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or hosting malicious content. The primary function appears to be redirecting users through a network of links, potentially to deliver further payloads or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://agrostroi-proekt.ru/ckfinder/userfiles/files/bimexuwu.pdf In PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/58299030291.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/33637732709.pdfIn PDF document text
    • https://e-motorcycle.tw/upload/emotorcycle/files/kurifogos.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6b608caf5---somerafijomowore.pdfIn PDF document text
    • http://xn--2vxr09c6mc.tw/CKEdit/upload/files/katijaxizabojovovulem.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe114cb7e6---ximexafadodibigumubekotef.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/82325466266.pdfIn PDF document text
    • http://zonweringbelgie.nl/ckfinder/userfiles/files/tujedidi.pdfIn PDF document text
    • https://xn--faades-mtal-n9a6a.ch/ckfinder/userfiles/files/momev.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/62aa3acacd4a5916cee8510576080775/5478027237.pdfIn PDF document text
    • http://hunting.kg/userfiles/file/89545260494.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c58e232a87c---50186819758.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/bavimosid.pdfIn PDF document text
    • http://falerisztika.hu/tmp/mezajosusokixofiku.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/1f6e3920a3937a006eff8fed818d6a0e/30283402975.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846f479d487---tewijixirepigalumare.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608108532cd1c---59529000929.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/tuxobimegu.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca6d7bcbd7---66269088114.pdfIn PDF document text
    • https://standardpromotion.com/images/upload/userfiles/files/84174549978.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/2dv7l5jusmu8gg9seodc530e0o/bonesakixexuzerokibexokij.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/7d3b40cfaab7f7caa680888d9427f0f9/fesedasuzubovawokinud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=fluke+t120+voltage+tester+manualPDF 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_off0000f118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF118 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001092f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092F 10888 bytes
SHA-256: 747aa8a2b97171bb8a55c8b009d528c5daf00788d4ce2273dde099f6e2c6c680
font_02_sfnt_off0001228a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1228A 20420 bytes
SHA-256: 16adddb9425ebf8cd4629f90eb961e0f536a50ef265099d89b820fd1d43dcea5

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