Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d3ed7e4cc543f3d…

MALICIOUS

PDF

75.8 KB Created: 2021-09-11 19:29:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b02b54fed864f3a8af23c5709316be5e SHA-1: 4506453d4ea9d254a206b627aad5989f0339ef64 SHA-256: 0d3ed7e4cc543f3da5f5669d79cbffc337ff6fcbc02c1a2202d66fd31e36962e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on what appear to be compromised WordPress sites or disposable domains, indicative of a link farm used for phishing or malware distribution. ClamAV detection and ML classification strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a malicious document designed to lure users to external, untrusted sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/uplcv?utm_term=the+count+of+monte+cristo+pdf PDF link annotation
    • http://joy05.com/_UploadFile/Images/file/galovibo.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/cb7vcpc7j0qo63olgd5kpcfoa6/pumixesogetijilazunof.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/25101327343.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/59670090329.pdfIn PDF document text
    • http://metallpress.ru/files/jafavebevuza.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/bavowemawudujetijesesi.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139550b02a88---59702343206.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/mokuki.pdfIn PDF document text
    • https://lideregitimpaketleri.com/calisma2/files/uploads/20356968745.pdfIn PDF document text
    • http://skrutit-probeg.ru/upload_picture/file/gisujutuni.pdfIn PDF document text
    • https://businesslife.com/content/files/15221049638.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/949a78e4d1f61019f489572465c7afc4/68640144699.pdfIn PDF document text
    • http://760_709737661.mildmedia-dev.eu/uploads/userfiles/files/40182853540.pdfIn PDF document text
    • http://draftingfloorplan.com/ckfinder/userfiles/files/nenewo.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/keguvumime.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sumurexas.pdfIn PDF document text
    • http://enidental.com/userfiles/file/20210907013151.pdfIn PDF document text
    • http://klhl.com/userfiles/file/wedutaxidi.pdfIn PDF document text
    • http://olynskiconstruction.com/pics/file/89106626753.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a14f607d1---moxut.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/lamexagosokileli.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/6462745927.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_off0000c2fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB10 17956 bytes
SHA-256: 65df0546f865710f8f813e3fbbb230ac05a10c8f9c59b773752dfbe602f4a17d
font_02_sfnt_off00010979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10979 10740 bytes
SHA-256: 03d92e0330950ffeee767f4c01bb7049b0ea99b95a3aef01bb6abe58cf29f72f