Malicious PDF — malware analysis report

Static analysis result for SHA-256 40a52404e06fbf8f…

MALICIOUS

PDF

90.5 KB Created: 2021-07-31 02:04:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: ce8485ab3b0e19a96c683934d09ce3eb SHA-1: 682b7cdfcf152c31c9d9ec1b10063f356c7ba3a8 SHA-256: 40a52404e06fbf8fed88911798dd7ce5e00d4b5947fbe4ffaf2893b78dd062d0
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV both flagged this PDF as malicious. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress uploads and disposable hosting. The document body is heavily obfuscated, preventing analysis of its specific content, but the overall structure suggests a lure to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://aircond.md/upload_fck/file/kojekoputerewetupegeto.pdf In PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1606d17fb4a3c1---81478082278.pdfIn PDF document text
    • http://stasta.com/userfiles/file/93697291813.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/hbokpe3ikr8ic59ab6r2acu48o/gazugejesewuninisewu.pdfIn PDF document text
    • http://stl-hk.net/userfiles/bedukadixepukixirot.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/xijasizololibubopofi.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/mojujowifeta.pdfIn PDF document text
    • https://oncetrabzon.com/resimler/files/8488777635.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/55028131897.pdfIn PDF document text
    • http://noahsmarinesurveyors.ca/userfiles/file/88343381969.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083374fb0c0d---gawegavi.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/6u82fks2133m2rvpl54ooqhpta/bisuzovukitovudegufafo.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/63293709436.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/zoruzavavavigupikenis.pdfIn PDF document text
    • https://bulgariapools.com/contents//files/rifidatigo.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/fojojowidusewipew.pdfIn PDF document text
    • https://easypayindia.in/userfiles/file/66699595543.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160a4471c599bc---65753713538.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607523e1442fa---44051101089.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/f7aeda84cd02f8389a416712bcde0d1f/22268470183.pdfIn PDF document text
    • http://border-inn.com/CKEdit/upload/files/fesagaxulorokavadimil.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe3f5d23dd---13836027587.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/4988961382.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=quantitative+approaches+to+management+pdfPDF 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_off0000fe29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001163b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163B 16768 bytes
SHA-256: a8b3747fa0dc0dbf64e3ffcec4c144f36eb0b1881c92fbf8e8c63a928127d9ba
font_02_sfnt_off000141dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141DC 11248 bytes
SHA-256: 7e557211482c6f4efb433227dead71478293374ad80b3d2d7fd2d41ed6c1a8a9

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