Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfcb655efc137532…

MALICIOUS

PDF

82.2 KB Created: 2021-09-18 01:03:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d8bdabba7fe81701244398d7ef8562e7 SHA-1: 61cf77027a73c607d3b48894a9fb5052565f8f9c SHA-256: dfcb655efc1375322f0f65f976c5cd0acce9e67a16a6a42d1a209713bf363a71
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV detecting it as a phishing trojan. The 'SE_CALLBACK_LURE' heuristic indicates the document likely prompts the user to call a phone number, a common tactic in tech-support scams or callback phishing. Embedded JavaScript streams and external links to potentially compromised domains suggest an attempt to deliver a secondary payload or redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://labmansour.com/app/webroot/js/ckfinder/userfiles/files/tatoratosano.pdf In PDF document text
    • http://automsystem.com/UploadFile/file/20210903181648094.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/95464693617.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161450f1f1364e---rirejari.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/pujolelelativokiramibus.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/50182991061.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/favaku.pdfIn PDF document text
    • http://gibisch.org/files/files/30374605205.pdfIn PDF document text
    • https://expomediainc.com/upload/file/dujuxulupuwadaz.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/14609947034.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f6be19a7f---16848807954.pdfIn PDF document text
    • https://procogs.com/FCKeditor/file/fojezevikexitosi.pdfIn PDF document text
    • http://xn--2o2b17g32e8xisqq.com/userData/board/file/44774509479.pdfIn PDF document text
    • https://citronel.com/userfiles/files/mekususalimavamikedunizap.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcc050dfc2---wifodatubes.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/22721926160.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/73870060892.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/renozora.pdfIn PDF document text
    • http://ahzgbh.news-read.com/upload/files/lodikiwurafonapekizuxa.pdfIn PDF document text
    • http://allier.proximeo.com/ckfinder/userfiles/files/tigudifolatupilinowamuvov.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/32424535796.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/47218640601.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/0k39eslt85efamkfojviajngo6/dalokalijesabumitil.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/bizokep.pdfIn PDF document text
    • http://zonweringbelgie.nl/ckfinder/userfiles/files/deligaguze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+remove+my+gmail+account+on+my+android+phonePDF 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_off0000d93c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93C 11148 bytes
SHA-256: e466302ea14a34f7c4179407cdb57d951a081f01e993a19d415912c4873c562f
font_01_sfnt_off0000f2e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E4 18088 bytes
SHA-256: d202606ad8660a14c03ad50f605e81085a277b2d784de05287fa650ae4925244
font_02_sfnt_off0001224c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1224C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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