Malicious PDF — malware analysis report

Static analysis result for SHA-256 1600d7ff5c670275…

MALICIOUS

PDF

88.8 KB Created: 2021-09-08 23:34:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 834159aed849438dd0bc39b306bf3035 SHA-1: 4433749a7d1e481426c7ccf94cd666ea570defb0 SHA-256: 1600d7ff5c670275852cc3eb01590e4f630bd671b8aa2d9b88fa15aa154fea0a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed for malicious redirection. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a phishing or malware distribution intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3808

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://irlanc.ru/uplcv?utm_term=extreme+driving+simulator+hack PDF link annotation
    • http://topenglish.sk/app/webroot/gallery/files/25113305618.pdfIn PDF document text
    • http://nguoiquangphianam.com/uploads/files/95973269787.pdfIn PDF document text
    • https://quangcaowebsite.xemlaco.com/uploads/files/43715651703.pdfIn PDF document text
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/27775718927.pdfIn PDF document text
    • http://plan.msu.ac.th/ckfinder/userfiles/files/54786505558.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d069ab2c5---vixodoj.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/vowalipudovedonedil.pdfIn PDF document text
    • https://kaemsp.org/upload/editor/file/waxovifajokuvawapozuwa.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/jatojobuvivetupijebuvifej.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/44474814389.pdfIn PDF document text
    • http://www.madiran-cruduparadis.fr/ckfinder/userfiles/files/lazekufasovezenusefonene.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/83605222418.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16130aab8360b3---kazasepewujeresipenepedog.pdfIn PDF document text
    • http://borneneskontor-landsforening.dk/userfiles/file/21268645841.pdfIn PDF document text
    • https://speculatio.in/ci/userfiles/files/fesepavobugadedemefax.pdfIn PDF document text
    • https://titishop.co/upload/files/45423882084.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/ninotijekekijulunepali.pdfIn PDF document text
    • https://digbijoynath.in/uploads/userfiles/files/madomupaduxesizegulu.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/54644298024.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/pezagotuzusigarajurora.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb67eb4f1a---dimolipixadunevazuxiwesil.pdfIn PDF document text
    • http://mediaworld.pro/ckfinder/userfiles/files/sepoxorelugogi.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/ximugulixurumitolivinusi.pdfIn PDF document text
    • http://about-dogs.ru/upload/file/91096756548.pdfIn PDF document text
    • http://geyuping.com/geyuping/uploadfile/file/2021090808380573499.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/sabozetofaretoxit.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/74358381914.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD444 23968 bytes
SHA-256: 58f9ffaa0b752bb58b19463e9a74fb4f2c58a6ac3f79840b3e86c77ebbb18696
font_01_sfnt_off00010f2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2F 11160 bytes
SHA-256: 7233dbd600efdeba7ee5ff769857d822f594ad06cf987a5f27df24bf0ed8f35d
font_02_sfnt_off000128ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14100 16568 bytes
SHA-256: 8a4b86ecf3c5d5626d089a5cd189c2f2c298042858d6c30538ccdc21bdf3eb63
font_04_sfnt_off00015833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15833 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc

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