Malicious PDF — malware analysis report

Static analysis result for SHA-256 931fd224653802f2…

MALICIOUS

PDF

92.4 KB Created: 2021-07-26 23:59:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c768eaed3c6a7c4477f3594c1827a189 SHA-1: f46a298ddeecfdf7fce6a23bc787addf6d3e9cdd SHA-256: 931fd224653802f2595f2cc8f1b7db2cff719fee11ace0bf9493088517f753ec
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, indicating a link farm used for malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c43a2d2b1ff---xurudodunuvako.pdf In PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160b8be4c53d35---92800296947.pdfIn PDF document text
    • http://amandamaitland.com/images/file/zumiseguvamexedinasuwiges.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/toxakudi.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/fixiwikoxosutax.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/85146e69bcfcab426ddbab779ca9b681/kexezatolawepononiv.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a1fa0b89e---mupajasel.pdfIn PDF document text
    • http://france-ex.com/images/blog//file/tokabegupulotevap.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f46b78f8d7---manuravixefenibekorede.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/zulafenusubotolapivu.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160de382368bfd---97187692549.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/5b9420b1a8f7a046eeca9d210996338b/deduzazatezofibategoniso.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c186d682686---70098783774.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/27750389540.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/6e519060ac928d75d008be1f61b71017/62819268301.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2152dceba7---kovopali.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9b0d7faf91954a6f9b245eb584969061/bewufuzosurawariwinadig.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/h6knt1ssrhne6qs0nesie8bn37/38796181237.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/72d411c6fb6ef8b1b10d9f26b5749fc3/zenujatibifarotuni.pdfIn PDF document text
    • http://keitbg.com/images/files/dasovumudegapeja.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/87964114413.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/48037574886.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607b339ed828a---jixivugixojodidapojulad.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/62204723793.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=rocket+league+how+to+open+crates+2020PDF 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
stream_006_off0000e97f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE97F 17336 bytes
SHA-256: 5b1ece2858138f7a79a29bd681241d196e070bce6b52f93084cc65376dc93dab
font_01_sfnt_off0001037f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037F 17036 bytes
SHA-256: 68ff46b74fe83f21cded66bfa9d3d06f98c9ab7b88e381f80a859df421639d40
font_02_sfnt_off00012fc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC4 11128 bytes
SHA-256: bcdd623317094f5f77e66f5ea42a0ffe79470363c4c30d60b962986eb4234473
font_03_sfnt_off000149e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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