Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7f32daad5b69f7b…

MALICIOUS

PDF

105.2 KB Created: 2021-07-03 11:47:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 94a6d2dccb4357be2b48db5b8af92bdd SHA-1: 4b196108e01630a6d90cdf8cd546036012155ac4 SHA-256: a7f32daad5b69f7bf90b9e968fee639d5fee36b1f7ce2a7d4a5b228fa95ac8d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9309

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 https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/ffd9fddbfbc978f506efdc401b542ca3/kudidiwaxijijilufodo.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160801f85ef963---89191111102.pdf
    • https://powermailer.in/userfiles/file/23033371689.pdf
    • http://brkvinc.com/userfiles/file/nenutoferogufirogugax.pdf
    • http://thebankcardservices.com/uploads/files/72971455871.pdf
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/81007156602.pdf
    • http://fouladsazanco.com/Upload/file/wagimonavegi.pdf
    • http://webinaris.org/ckfinder/userfiles/publics/files/vatiwoluzudelef.pdf
    • http://njuhome.pl/ckfinder/userfiles/files/39296571843.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3fb94e325---nefutenasu.pdf
    • http://langmypham.com/luutru/files/36217193029.pdf
    • http://kapsalonindex.nl/images/uploads/93652440246.pdf
    • http://debden.org/userfiles/file/tetigamijofudukude.pdf
    • http://5uempat.com/contents//files/jifixapinosobota.pdf
    • http://alexhofford.com/temp/files/file/85506218532.pdf
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/84d8ffc205f655d0fc2dec2374df2f1d/1800032262.pdf
    • http://urbanconstructions.org/images/uploadedimages/file/magupu.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160aea82d9bbda---32069835729.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/8td2lnbcns7mn2rg9614fk04oi/puxewepuruvavuvefosej.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0a0b22bcb---21554240841.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/rfoc99nrj3svf91rqca90udq02/734065978.pdf
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/eldicv1bf5ujamgpac92g598u0/65669234992.pdf
    • http://boilerservis.ru/uploads/files/36041549811.pdf
    • http://madonnina.info/userfiles/files/8112280931.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/2camsneveq1vcsfv07hi2n4mn7/werisoxiginovevesobune.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607c26e85aaf7---88418034915.pdf
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/616cc3b184827e2bce49e25d18faf240/lexaruropikowozibagasuju.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=english+to+german+dictionary+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010131.bin
667e919edff30dea990feff6dbb6192d22528638381428f99c53e2244bb44ad4
pdf-font-stream PDF embedded font (sfnt) at offset 0x10131 11164 bytes
font_01_sfnt_off00011ae4.bin
485f1953225ff8f5deddc9b0735f3862213649cdafe970cb636be0000e15fec2
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE4 19540 bytes
font_02_sfnt_off00014cc9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14CC9 16792 bytes
font_03_sfnt_off000164d6.bin
646bb0ea6f1968f19bc60d69e9aeac2de21dc6baff43252da91a4f010fbfddf6
pdf-font-stream PDF embedded font (sfnt) at offset 0x164D6 8800 bytes
font_04_sfnt_off00018055.bin
00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
pdf-font-stream PDF embedded font (sfnt) at offset 0x18055 16140 bytes