Malicious PDF — malware analysis report

Static analysis result for SHA-256 52471cae5d34a005…

MALICIOUS

PDF

107.6 KB Created: 2021-08-09 05:23:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 279cfda0202511102a3064ea433afe0e SHA-1: adcc9b61ca9c4ef1bdeaa458e46e1b352dd1bf6f SHA-256: 52471cae5d34a00582746b12f7ad2fb270f0b3157044ce407be7f5a166fce33a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, likely to host or redirect to malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL targets indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9677

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://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16071e5b0a9d08---polabuzizesagigofagutebov.pdf In PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/075ef9942662e07b7a20062229be0064/dugevo.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160989526d3676---pewobevuze.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/qc14j7sidh8618t2jscep41205/93802778130.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210706122405_xvt222.pdfIn PDF document text
    • http://studiodebiaggi.eu/userfiles/files/majufabuxuvobusupowo.pdfIn PDF document text
    • https://all-new-wow.com/upload/files/gorasijipowabalupo.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608c28d0b1361---tuxewidogomepatoxunijediw.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/160799094cb774---jotitutix.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c82c8a0e02---97133115025.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16083e3f723692---badimo.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/9e18414c2345df23d7fbbee319981f46/35750031980.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/88084488274.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/20225345546.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/3748116878.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/7e3f20f88bd4d52eb3fd445ff5e47260/46534864689.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b16d86a1f36---84536596420.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/c00uft50sifltg61qt3t4idkni/davuli.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/93580ce88bbff11375333f9b146c93f0/wisodoxivomepod.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/91117420120.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/30025496683.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/79f634ef5d26753d10225b2122d8f296/lopejuto.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/93079007445.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/dirojugab.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/b8590902f46d645194fe8e0cc06e2616/vojajin.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608521a00e3f5---5429404949.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/60ql26vor33jj1hn9q4jrmumai/64310043707.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+test+soil+bearing+pressurePDF 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_off0001347e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1347E 1676 bytes
SHA-256: 7a5613d4a6f4e405b2035e5a9a12226afb8290a571abbd10372e79c6281f3093
font_01_sfnt_off00013c75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C75 19152 bytes
SHA-256: 4193cd15c69403de13ddf7b55b93d8342bbe723c292a312af30181c7189fa346
font_02_sfnt_off00016f55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001876c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1876C 10744 bytes
SHA-256: 59da49eb51f6b86912f0ad92097baa18dd5d1c30040e71c56bf0796b834aeafb

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