Malicious PDF — malware analysis report

Static analysis result for SHA-256 c579c7730dd79aa6…

MALICIOUS

PDF

113.0 KB Created: 2021-09-02 13:02:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: be5a72c5b4f8db532b3bfa37ea4b72ae SHA-1: 5d078ce62badef3ed3bb1dfe7f78b8ec63a76b85 SHA-256: c579c7730dd79aa62d0ca5f161075fbaaf07b4acfa621aae83bb1e82a9e02f70
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics confirms the document's purpose is to lead users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://garglob.ru/uplcv?utm_term=re+zero+light+novel+volume+4+pdf PDF link annotation
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/u3ipjrq9i73dnt26fpd26n239k/gefifurororelejudupate.pdfIn PDF document text
    • http://lobi.md/userfiles/file/nutititepibilugexalikeger.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/62354478670.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/fvuc9jvn4p4lgvv7p4jna0u905/xubibovep.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d9d6a5e9b0---91926910993.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b89ad995fec---gasoxaxumosiwupo.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/38908388040.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/53240670254.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/cb33654a56025ab8db1923d353bbe4ca/soraxaxo.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16073005e55273---67962512713.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/fifudefuguwebolijewinik.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e871ffa76c3---22652573266.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/89170673952.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610430c33924d---16856295451.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/32382340927.pdfIn PDF document text
    • http://futsalcb.cz/picture/vtextu/file/lowuguzemaxigo.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/25599049932.pdfIn PDF document text
    • http://ilpeace.org/assets/ckfinder/core/connector/php/uploads/files/godovisekasibuzujixuwata.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/84331439780.pdfIn PDF document text
    • https://nacituran.com/userfiles/file/7677085662.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/doxeragilomivojimofelir.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/46ac38242650f134955aa8fb35006c50/11396514250.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/likagadometaf.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_off0001531e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1531E 10964 bytes
SHA-256: 83b865555a0ecba145fa3f716c9154d07d85a1eee06ecfe56ed6648241a4e559
font_01_sfnt_off00016c36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C36 19508 bytes
SHA-256: d17469a17d8d5b5fb667a013f010497d4d4731d39dac6538421c5eba36e20665
font_02_sfnt_off00019e7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19E7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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