Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e86bed59614f780…

MALICIOUS

PDF

78.1 KB Created: 2021-09-11 16:19:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 12c6fa4a2cf3e3483401ec0866931be9 SHA-1: c32fe69924066e570e00722a1392b56c70dc22fb SHA-256: 6e86bed59614f780c9deb455d98c8e288fb202785a97ec930ff10823e1db3a0b
184 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to execute code, potentially to download additional payloads or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://philabc.ru/uplcv?utm_term=mi+app+lock+apk PDF link annotation
    • http://casier-a-bouteilles.fr/file/17168706464.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/19093697001.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613946176695d---fulamobaf.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/xikakaraxap.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/55062183155.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a5994e1ff---fofajuzopobizegaborifopup.pdfIn PDF document text
    • http://gerastar.com/userfiles/file/rofoxumaf.pdfIn PDF document text
    • http://misr-consult.com/userfiles/file/nabikilonekuxoribaki.pdfIn PDF document text
    • http://hk-keber.de/images/file/liniti.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/4582993ba2a0fc9d67f940d8de65347f/85836928021.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/23127642060.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/betoxeweluleduw.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/75095596703.pdfIn PDF document text
    • http://eis-pieschel.de/UserFiles/File/wabefoziveseg.pdfIn PDF document text
    • http://adgroup.co/userfiles/file/66055564659.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210902065911_2ldghy.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/18477944094.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/nuzirazajono.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/meponopasifaxafo.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/fojuxamugipewelomukavi.pdfIn PDF document text
    • https://phu-komplex.pl/pliki/file/rosexalufogonojukasaj.pdfIn PDF document text
    • http://naszymsladem.pl/upload/file/42894024926.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/13297176412.pdfIn PDF document text
    • 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_off0000cdc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC4 18416 bytes
SHA-256: 61b528e96054fbed89ad8aac0a061101f2cf19762a5b12b048d963809ffeaf0e
font_01_sfnt_off0000fde3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE3 9852 bytes
SHA-256: 094df6675ef56f19e20e874a31c25b0dad442225b459a32a4af9f57784669e4a
font_02_sfnt_off000113a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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