Malicious PDF — malware analysis report

Static analysis result for SHA-256 66c6509f5d0c0d58…

MALICIOUS

PDF

84.8 KB Created: 2021-08-26 06:45:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9cfd2979721c63837e75f2745eda94e3 SHA-1: 9acdd681188c3ef63d9a426e813f466094c26865 SHA-256: 66c6509f5d0c0d584501b61398a41284711385480bc42b31d592bc03e7766fa9
164 Risk Score

Malware Insights

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

The sample contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The PDF also functions as a link farm, pointing to numerous compromised websites hosted on disposable or compromised infrastructure. These factors, combined with ClamAV detection and ML classification, strongly indicate a malicious intent, likely for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://philabc.ru/uplcv?utm_term=chewable+compound+magnesium+trisilicate+uses PDF link annotation
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160718677bb1da---50052441122.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210809134357.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/bb7cc09d19261ae0fcd506194fbd55e7/rufalorolupijul.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/6425352287.pdfIn PDF document text
    • https://jxlmedu.com/file/files/20210815_004942.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085db16c58dd---91452182680.pdfIn PDF document text
    • http://stewartreunion2020.com/clients/2/2a/2a0d9dcdd57715375c9f4393c24df0f2/File/69045366977.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/fd9b0351afaff1cde5b3ba52266eb135/durilum.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/91442115244.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/33899748537.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084599e8211c---lojudanoj.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/5279fa64dc8749cd25441c48ac2b7f57/fixafaxemajetovo.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/95538683718.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/lizamilija.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/34a247b9445a260c9291609437b847de/bulexumavu.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/85991492172.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4a9053775---10870271179.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/b7031aaf95c9c05d5ddfb7791e1bddbc/91814275262.pdfIn PDF document text
    • http://gok-maciejowice.pl/js/ckfinder/userfiles/files/wuwegulofi.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/siziladobatamopowiwusilod.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/lvgtlr14jrlk1gkumkp82ph6gb/dofujovemefoluxiketi.pdfIn PDF document text
    • 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_off0000e529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE529 17364 bytes
SHA-256: 0f3366e9c6e2c44397a3df3c25ec13b3ebb36b8864b04bf701798d907be291d7
font_01_sfnt_off000112e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B00 11316 bytes
SHA-256: 261aece29c3ce8aabdc0b3d5e8aa24d65789c1a0564fafbc3cfc15569389d790

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