Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a408de77ac4ed1f…

MALICIOUS

PDF

88.1 KB Created: 2021-09-07 16:21:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a7b64a30719ce34441632223499f29a8 SHA-1: 5c9017c97950b9d0433eba58482779de9cc59d18 SHA-256: 8a408de77ac4ed1f5e820bc081cc479911314a802903e481fb9476750ae0bfa8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document identified as malicious by ClamAV and an ML classifier. It contains a link farm pointing to compromised WordPress installations and other disposable hosting, suggesting a phishing or malware distribution lure. The presence of external URIs and link farm heuristics indicates an attempt to redirect users to malicious sites.

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 https://ketchas.ru/uplcv?utm_term=derrida+otobiographies+pdf PDF link annotation
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/2172bebf55eac879919ffd7c6c5cf32f/68293007743.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///52223787435.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/kikov.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/mijuwisexetopab.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/54578149159.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/76209332317.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/pokazusanenuvat.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/r2vu21c6lvefru14m2ioso488q/tubipowof.pdfIn PDF document text
    • https://webmenuplus.com/images/file/68469271217.pdfIn PDF document text
    • http://scro.ru/pic/file/30972594497.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/zotorazovujibilafozipes.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/45069098669.pdfIn PDF document text
    • https://seerupit.dk/assens/file/zabagaxu.pdfIn PDF document text
    • http://kasargod.net/uploads/file/sovubexo.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/4739220447.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210625205356.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/dumerisad.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a61b1fd6c97---vobezizobazen.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/21032734014.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1606d992a27fff---70203449860.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/e1k33onst1440tpov0jdda6jbd/fogexari.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/p0ikfjud4dkc0aqa0dae4o1psv/56613411875.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/f51f1a0edc415422d6bd7b500acdd42a/gimiputegadininob.pdfIn PDF document text
    • https://tungqibiotech.com/upfiles/editor/files/42323606027.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/nowofo.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_off0000f068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF068 10768 bytes
SHA-256: f7714ea49a734fcf8341c4d98b019d7331b385054ecb480fbb9070a635f87ec8
font_01_sfnt_off000108e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F5 19196 bytes
SHA-256: d366de70c6d51e3b1ef00bb5b2b069e405b20264bf1d58cdbebcfa224743af66

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