Malicious PDF — malware analysis report

Static analysis result for SHA-256 9837db76c388cf67…

MALICIOUS

PDF

86.4 KB Created: 2021-07-24 00:57:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1882c9e36cffd8a2f0d55a7613763471 SHA-1: 63f8049e0e304ad82638537683c0436c82c451b1 SHA-256: 9837db76c388cf6753b40d0d2727694b59bf1f1e25f9333dff727a56f84b5356
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV detection and ML classification confirm its malicious nature. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/78e94e2e9c543821a3842c9be7db664f/56461436478.pdf In PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/1414146800609409122c524.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210514190617.pdfIn PDF document text
    • http://vvk-wiedermann.at/userfiles/file/20160500454.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/37482282707.pdfIn PDF document text
    • https://biovuspharma.net/userfiles/files/powajirowinadev.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d411637e8ae---fubaniledijagijabonaj.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087e81f366d8---10979788726.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e55f249be32---73425154423.pdfIn PDF document text
    • http://www.climatisur.com/ckfinder/userfiles/files/8495518891.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/fbe5828db8e7e506bff9e7bef3445ae4/73993420425.pdfIn PDF document text
    • https://sambelteri.com/contents//files/25136666040.pdfIn PDF document text
    • https://le27.fr/docs/file/jelixalu.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8039ee60b---masite.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/vblsifln6cpj77q3dnvea2vlm5/lerividezawu.pdfIn PDF document text
    • http://jezirka-biobazeny.cz/UserFiles/File/87815981480.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/79684420941.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/kabnq50cvdte7a50vs4vqaukr3/2446016175.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/bd438cbdc2c2e0d8b9d2b4db55b16050/ranofuzi.pdfIn PDF document text
    • https://paradigma.bg/uf/file/dawegirugoladudimef.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5864f8167a---68201466008.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/wuxexobukenevaseletefaf.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/f7c8g4j5576258ohqbfkifei29/lovagibadi.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/juwowik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=calendario+abril+2020+pdf+para+imprimirPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD451 18740 bytes
SHA-256: d359db7b5584bc77785adafa8eb0d4f141f7e5e30acb91ad98a3a1c99a8121f8
font_01_sfnt_off00010350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10350 16712 bytes
SHA-256: 437cd4fb31528fbe744fb46f6120383a3f0336778ca7ca1568636e0edb917dfa
font_02_sfnt_off00011a77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001328e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1328E 10804 bytes
SHA-256: 548f92d5912d31fb6faa7993521eac5c693a60ebd30e451b49a80fa0fb07cb0c

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