Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfaf7c1272abd83a…

MALICIOUS

PDF

85.6 KB Created: 2021-09-19 09:47:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c801b6ef72cf9f35309a724588bfcf74 SHA-1: bf58e247e86a0b04d822adce97742e1271a7d26f SHA-256: bfaf7c1272abd83a996d1bb0c94c0535a911c110483bdd104bbe68e825fe6d81
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous links to potentially compromised or disposable hosting sites suggests an attempt to deliver a secondary payload or redirect users to malicious content. The document also employs social engineering tactics like a download button and callback lure to trick users into interacting with the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 9

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://empezo.xyz/js/ckfinder/userfiles/files/10590144180.pdf In PDF document text
    • http://davobio.com/upload/files/65918181746.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16134da6d9d85e---zedajurus.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/35417782839.pdfIn PDF document text
    • http://uran-berlin.com/userfiles/file/lunada.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/542ca7e53bf131b656b463b34a6e93e5/wabukanelinoku.pdfIn PDF document text
    • http://parfumland.sk/upl/kibidujozobedirezaj.pdfIn PDF document text
    • http://teknis.it/userfiles/files/65149549612.pdfIn PDF document text
    • http://phunggia.biz/userfiles/file/nawewirepozikopov.pdfIn PDF document text
    • https://xenang-mitsubishi.com/fckupload/file/kuwipigipexivosib.pdfIn PDF document text
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/kuwusupafo.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/63610998683.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021091402115169.pdfIn PDF document text
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/mabetosoboverebomusetoj.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/jukajofoxezivarovifo.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/1255766039.pdfIn PDF document text
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/bijupadibarolexutibuva.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/62801499112.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/894dd9db1268a8891880ba5a25f1dbea/ferovaxewexinuturobosul.pdfIn PDF document text
    • http://etepi.pt/js/ckfinder/userfiles/files/77500294959.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1614120e3615af---54928779745.pdfIn PDF document text
    • http://infinity-c-t.com/userfiles/file/xuxere.pdfIn PDF document text
    • http://carbontuning.ru/file/81091054663.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/bekamape.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+delete+an+account+from+my+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_off0000e819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE819 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10030 10916 bytes
SHA-256: 60ae872937e1ba24577dcfe8e26be38b292a0e6cbe793ef806ba51aed28c0a4a
font_02_sfnt_off0001194a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1194A 18188 bytes
SHA-256: 33d78f17c23506accaa67a07459ea081b3c00e5c37ae432fb823df139223239d

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