Malicious PDF — malware analysis report

Static analysis result for SHA-256 627b6c36942fdef0…

MALICIOUS

PDF

86.8 KB Created: 2021-07-31 00:57:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a1f24aa77714015adc7ccb40170462b8 SHA-1: 320a161fd77ff1f96470c04497e8b2baa54afe1f SHA-256: 627b6c36942fdef0da53f2ce18d73f58a48c0ddba4cf7a45076de3a20cb1a775
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to various websites. Several of these URLs are hosted on compromised CMS platforms or disposable domains, indicating a likely attempt to lure users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://transfertrolley.cn/d/files/84375155021.pdf In PDF document text
    • http://parzenica-bialka.pl/userfiles/files/70824585698.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a087c1fbf8---kejinalikurim.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/18249223197.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/47213c006b20090c7c7afb6d2ea3253f/3307108029.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/e5347fdc98acd19017d023e1aface879/difaropulakuduwota.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/91444462706.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f9b678f30---fojedovofijavakibidimarer.pdfIn PDF document text
    • https://nidi.mk/ckfinder/userfiles/files/43762517332.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/jugimixubizikigasawesige.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021662138145569.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210730_AD7111AA97F6AFAD.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e0eb79802---xubetozerulelulopunuxas.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/a860d4194b3fbe4e1afbb568c29002f8/17066259376.pdfIn PDF document text
    • https://mangmalungtea.com/userfiles/file/xefalokofojulojosirotobi.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/72373803453.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/zovovezutip.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-7-31/20210731005136364329.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/f04c853de791eb5553078d89119badca/xiniminisuzoketukolexi.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/6c1od6jkkvtp50nsjuntoirosc/foneguvabofelo.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7b6d7ce97---nosolinilenonovexun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=what+does+it+mean+when+your+firestick+remote+flashes+yellowPDF 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_off0000ed61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED61 17576 bytes
SHA-256: 54bebb0d6f1e7a0ce711a8ac0c51c4bb92c55fc6097a6848e1195d4a658c44b0
font_01_sfnt_off00011b43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001335a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1335A 11124 bytes
SHA-256: c80ddbf5ed94d874d7f42c743bbaca4d1c35a1fd575e29ab7c7658422cd72f46

Open this report in the interactive analyzer, or submit your own file for analysis.