Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bef5d016b51e710…

MALICIOUS

PDF

87.5 KB Created: 2021-08-10 19:47:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 625ddb6ad93e23ff5fd201b51a883135 SHA-1: b8ab133f0c029c9fc8c45212077f3fd8e99d6e63 SHA-256: 1bef5d016b51e7105f1924241ce826ae3490016ea74929b0a1929119b1a5e618
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm for phishing or malware distribution. The document body is heavily obfuscated and appears to be a lure, possibly related to a 'formal resignation letter sample template' as indicated by one URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/15e909903a423bcd3c453321a579d623/91046559483.pdf In PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c25218cbb0---2118937951.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/rulopenapubikabel.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/87982645023.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/majimeberufulubelime.pdfIn PDF document text
    • http://mrs724.ir/basefile/drtiketcom/files/rekogis.pdfIn PDF document text
    • https://anfauglir.com/images/file/pudasesenabujoniruvefi.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/lowajile.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/newusugodivorezerolag.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160ae06d7ebeaa---gewivutonikix.pdfIn PDF document text
    • http://hobbstownis100.com/clients/6/66/66141d04a4341350d76ae3a38785cb5a/File/66127726338.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/9adc91019f46ee9567f4cf88f6c6cac4/83539035334.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/rolijetamosewimanev.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/69892015159.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8f208544a---xefepoxeka.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/petodimefagexule.pdfIn PDF document text
    • http://skupka23.ru/upload/m/lukewira.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/92619eeccce8e1c92b32cd0f8daa46d8/wemimaxab.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16072d39b3e9cc---52702401638.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/vupolotefabul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=formal+resignation+letter+sample+templatePDF 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_off0000f1ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EE 10572 bytes
SHA-256: 207eef89e04af0efd325ee62fb7d434180ce659566b7c0c57a462de121f340c1
font_01_sfnt_off000109fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FE 17840 bytes
SHA-256: ba0b3a6375d8fbce706a6230de0a5961a5da593de3a30268b69f2452793be061
font_02_sfnt_off000137fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1