Malicious PDF — malware analysis report

Static analysis result for SHA-256 550cb717f1535db5…

MALICIOUS

PDF

78.1 KB Created: 2021-09-02 20:06:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ef8ad3da5ae735635376741a39f1433a SHA-1: 9f64d1455deee6121ba8ebe7af7f0038f520417f SHA-256: 550cb717f1535db5f67b9bc80547ac2b2b9f0f26fd77af8cf7554c8e6d5698a1
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to compromised WordPress sites and other disposable hosting, suggesting an attempt to distribute malicious content or host phishing pages. The presence of embedded URLs and the overall structure indicate it's likely part of a phishing campaign, potentially using a callback lure to engage victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/ffbe08f0a50cea4dec32ec9793d3a30c/guxetowakanotugefawotuv.pdf In PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/wopogojobazosilawuwitufe.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/xejudez.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a8f6c0653---39637091470.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c98de20522---tutowun.pdfIn PDF document text
    • http://izdo.org/img/userfiles/files/libamitidezibe.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fitidofixevevufabako.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/nesirelijaside.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160949f35a33f1---76080657239.pdfIn PDF document text
    • https://eniedu.com/data/file/20210730014426.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/nofegixunifabadejegukog.pdfIn PDF document text
    • https://nwdglobal.com/ckfinder/userfiles/files/loduvodoxujidewewagibapi.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/339568344.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/8f85f03f04bc8476fead77bfadfd5471/femijikujemidukekazexavob.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/gakamitopajevod.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/25b8d848ed9c879f99084e3a25414180/4404973209.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/301530453412.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/8228071384.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/41719812049.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b64db97cf10---fitabokegefuwoxibetunaxo.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb3ed0b30b---74300438692.pdfIn PDF document text
    • https://mindspacepsytherapy.com/upload/ckfinder_temp/files/20210528091559.pdfIn PDF document text
    • http://salocchi.it/userfiles/files/15094461556.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=working+of+two+stroke+engine+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_off0000cf7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF7B 16724 bytes
SHA-256: 789282de3cc568aaa4b3b9d021b195e1e774b0b5236d453b9206e544ef852b83
font_01_sfnt_off0000fa41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11258 10636 bytes
SHA-256: 2141c3a58b7cd8d26ca8546216a1bd1cf33951a144ec1b31075d087a0039c4f9

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