Malicious PDF — malware analysis report

Static analysis result for SHA-256 c348c5fd31c4fde2…

MALICIOUS

PDF

82.6 KB Created: 2021-09-01 16:14:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1521b83ba6734fb05e467381dbe7f2f8 SHA-1: 5dc2e18810aee2b8df174fb560176c12974e37ca SHA-256: c348c5fd31c4fde2209e82dda4acf42446bef3db387bf3d1bab67b7c7424bd41
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm pointing to multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs are likely used to host or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873f6a1903a---92151329994.pdf In PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/91cd0cfe507e056570e974cfbbac7683/32787960895.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/28365598629.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079004cf1fbb---fudusegipesopobetewimopog.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/kejufosuxesefebepebeve.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/59820435830.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/ferapeburijon.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/tobavebawekakowo.pdfIn PDF document text
    • http://chinhlytailieuluutru.com/media/ftp/file/81399053808.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/07094cd74d5c523dd13eacc77c36c7a8/demotiveron.pdfIn PDF document text
    • http://hkalc.com/userfiles/99087283224.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7672cde03---24246206771.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210614113054.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/57965207425.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/xezutitubamiditi.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160892a2fc483e---wiseparekabumubipuwi.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210719042052_j2bffz.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/3jhfuhigtu91egnuv5cj9q7fh5/28090562208.pdfIn PDF document text
    • https://ski-valloire.com/ckfinder/userfiles/files/23647485373.pdfIn PDF document text
    • http://wf515345.tw/CKEdit/upload/files/76889214922.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f3dd68236---giwuzorixenevitap.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/1c4bbf4e7c9967562b5ab853e00ad59b/47217725879.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/vozetokagekikifazelukewuj.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cced6d0f1d---68659548613.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=play+pacxon+onlinePDF 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_off0000e121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE121 10216 bytes
SHA-256: c096955c1ee16be3fb1229b5c2320bad50ce9a55ea3ba53f62c8da9ca5a9234c
font_01_sfnt_off0000f829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF829 17084 bytes
SHA-256: ad4a5138cc31a3f6bf5db429588f139e670070e734106a1c3689217e0da82135
font_02_sfnt_off0001241e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1241E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1