Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5198a9ac6590dba…

MALICIOUS

PDF

100.4 KB Created: 2021-06-28 09:18:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a61b97a3ed6a70cf445c331b3ac2875c SHA-1: e8f214a0c945c602a81eda5ff5f6c5e960cc04b0 SHA-256: c5198a9ac6590dba6c29174d277f22bb68f2164afff732dce610334a30c497b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and the compromised CMS upload link farm indicate the primary function is to lead users to potentially harmful sites.

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 https://crysiq.ru/uplcv?utm_term=would+you+rather+questions+for+girl+sleepovers PDF link annotation
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/ee676818034a2ef2ff50dace47cc0318/49219025045.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/9322ba9f9e1cdfce3e757c7f4b9483bf/xalukokomipeletakoporujin.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/noludixolonusufe.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/45ca3e406e47fd38c28d48df28040610/tisajosixifigebug.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a89cc75bdcb---39330548249.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/gepaneb.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b99cf197aea---kozozanedebotizup.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/rawujopopokadewe.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/d7uu7ftbr0t6b42fuge0fckbe0/xesof.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/4kii9jafqhltrpda308kblqprn/kijexilixokexo.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd2a9963d1---87898704691.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/00err00j9h95qu5rbsl1khqvcd/57394487655.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bca05fb0b42---gikiwomimurexon.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/90101474834.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/hqscds3lnadahqc2m6d8crf3t0/61298880604.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/42729875729.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/341472c87d23c5e8e3c1d5dc97d877d5/besekalobex.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/16870961224.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/37749e238d7d7863730cc2c09b1f4e87/sipigibegabitatebifofe.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/4ofir8gn9l237gknrp1i87h2ir/12471661478.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/1499c03449cb0621f65d7bee1eaa586e/biwize.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a587d12fdeb---gawozazatirojesafenas.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_off000126e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E3 17284 bytes
SHA-256: c57fc5ecff25bb693593b8c29b821c0bc386abc26aaf2434a40c359d7e5e89e9
font_01_sfnt_off00015371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15371 11196 bytes
SHA-256: 1f0641259e23c8b21dbea2e6bbff792000fc80307812cdce1a3843cd693ce86d
font_02_sfnt_off00016d23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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