Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9e73877ab00959e…

MALICIOUS

PDF

104.1 KB Created: 2021-08-04 15:35:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 9e433d2c36d3b11f2e4cf3e06428f865 SHA-1: fa2f0c79f3cb18af86cd0648bbd5cb39f9a76c8f SHA-256: b9e73877ab00959e745e567863e81b502b9ec96fcdfeb2707197faccfdbe0a06
156 Risk Score

Malware Insights

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

The file is a PDF document detected as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The presence of these links indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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=how+to+shutdown+android+head+unit PDF link annotation
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080690e13d98---kafigosetobuvukabinerimo.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/bifakesufalugafusujoxebe.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/40098934458.pdfIn PDF document text
    • http://vucert.vn/uploads/files/rujokepedelizifonulirot.pdfIn PDF document text
    • https://csodamalom.hu/files/files/98416749524.pdfIn PDF document text
    • https://basundharamart.com/userfiles/file/dosumeriku.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/66774425551.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/49068732842.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/2580349309.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160883625dd4a4---lavedisobetot.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ab97730f7e3---neziwokagovez.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/a4a15be6c885bffd824eece1664adfb3/rekiw.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/xujifula.pdfIn PDF document text
    • https://anakmeong.com/contents//files/96849436737.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/v8lpp691id23qo5i42d4nfa26f/91074343767.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e89a3eae10---xuxeso.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/jekotuzapipejo.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/fegebizuzuluzanod.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/zozanopotemosojobitakebus.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210725222556.pdfIn PDF document text
    • http://vivalepurrexotics.com/clients/2/2f/2f65fe2011b8f0b07f64c29a74835a02/File/5571786823.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_off00013499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13499 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014cb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CB0 10476 bytes
SHA-256: 7bcee5f6664b39f5c1820817ef4eda3c28cc59b3390defe09974ea71f4b6ee81
font_02_sfnt_off0001646c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1646C 17584 bytes
SHA-256: ce5f1d00504cacc02ba7ba0c501137e6dc9749c3a19263d9be6ea658d80674e7