Malicious PDF — malware analysis report

Static analysis result for SHA-256 23b6b2225b818359…

MALICIOUS

PDF

94.1 KB Created: 2021-07-01 20:58:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d1372ca18ff565ef900df024cb7c9ae5 SHA-1: 62b9680ec449e18c0b946000c48ece8720357d87 SHA-256: 23b6b2225b8183599b2399c298a87715c79a6a69a0532eb767d2d419fae49721
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting an attempt to distribute further malicious content. The presence of invoice-related language further supports a phishing or scam lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://aggengr.com/uploads/CMS/file/tepagisor.pdf In PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1609acec587197---84263870025.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/busubasiwezowageforaxumok.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d387a47fcb---zerevet.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b5e986bf8---14538173247.pdfIn PDF document text
    • http://www.ks-zahnarztpraxis.de/upload/files/66574434934.pdfIn PDF document text
    • http://lyjclinic.com/ckupload/files/40165329245.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c28bfd13c4---22815515362.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073dc4d48e6f---96550296525.pdfIn PDF document text
    • http://chikatere.com/Upload/files/81223226758.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/lfkcbm72gef5des4tju6srb9bi/75667384686.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/c035cc82fb5063a8b922be5c3f705c9c/85025624901.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/0fcf24d6917c38767a406245dd2829eb/pusodi.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/54dbaaf5e70dc918825d9405011c49b2/29732822401.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/363a2b1c028af8a98b1c12b9f33ff7bc/59426279557.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160bcbf3534d0f---98413528932.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/me2ihcansausms2tp2ss7fvh33/rixidisa.pdfIn PDF document text
    • https://drsubhashawale.com/ckfinder/userfiles/files/nuzepinerizazonatuwe.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608402194e8f1---kobugap.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e534ce492a---90104615095.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/99aa7c051aea660e5bf66031fda73028/88140965382.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c47d8b833---wexesolosotukabuxodadib.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/10d94bd73b5f2562212332e92cff0aae/duvagevazuzidimizawusujaf.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/4m6mcetspa43j2m4gslmoqkaei/87682366950.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/29583522542.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=letter+of+authorization+for+proof+of+addressPDF 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_off00010908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10908 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001211a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211A 18180 bytes
SHA-256: cf9ed788a139f989979fff8a02871db0886ff5cdd952cb0c0bc1b4489a4b8e6e
font_02_sfnt_off000150c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150C7 10664 bytes
SHA-256: 9fb5f3da0d0d801cf2b208117ba80b6db3416a891903541eec22af30a847b93c

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