Malicious PDF — malware analysis report

Static analysis result for SHA-256 437f5e84ac46d851…

MALICIOUS

PDF

71.8 KB Created: 2021-09-06 02:50:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fcf50160bf9b301b35509c9ed149b13e SHA-1: c3a9b994e92389922d4668b09dee5444526bee95 SHA-256: 437f5e84ac46d851d25883705b64cf1dfa34dfcc9665b03881099966fb1e9663
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate this is a link farm, a common technique for distributing malware or conducting phishing attacks. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097008571dd6---59235755739.pdf In PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d83b7fddca7---98571709820.pdfIn PDF document text
    • http://intergeored.com/upload/File/gisusad.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/71961457231.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/18956457819.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/32140923466.pdfIn PDF document text
    • https://uangraja.com/contents/files/77829428964.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/75340944127.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e094501f18---5681207821.pdfIn PDF document text
    • https://scanclean.bg/upload/ckfinder/files/65069332602.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/32493175487.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210821_EFFF268DD392C751.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/73875709434.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/lozodexebiwusutodis.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1aecda2c2---93741051231.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/3b742fc01209c50b83505d2a16f27d1d/79465893613.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/jopinenaxibez.pdfIn PDF document text
    • http://poorclarescork.ie/images/32025247668.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/fiwasajejawebolaxi.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16084007c5edfa---jexixipoleminegikixike.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/32ffd02535b3377a59371ae9775c2f36/74115494511.pdfIn PDF document text
    • http://cpspcb.com/uploads/files/pabewovadob.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/69068185896.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/jitigiworilefumobi.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/73468491237.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/50459762084.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=devi+aarti+sangrah+marathi+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_off0000b483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB483 10844 bytes
SHA-256: 1e393140243e1062cedda55d64a409eaadc1384b7b436e89244a556e2fa8ab7d
font_01_sfnt_off0000cd2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD2B 17204 bytes
SHA-256: 311744e00e6ddc7c06904e2adf8814f9d9d246f1951f883f67e10ce6b0304e4c
font_02_sfnt_off0000f9ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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