Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2969665ac503d33…

MALICIOUS

PDF

81.4 KB Created: 2021-09-01 09:33:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 4451039232b67c38189cdaf64cc96d29 SHA-1: 9aa0463f7c09f6437f18d3225445f7a72047b201 SHA-256: c2969665ac503d3398582821f97897d9dcfad0e54ef29b499c1331f2f4001fe2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL analysis point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 http://sity-luxe.ru/userfiles/file/zazuviwitolexekigavaberoz.pdf In PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/a25058acd2feef20628ce1c84eb77c57/pilixadepebebosudari.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9fbd1bc01a---xuxapumakutodalok.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0813/b5aa0d20a0dc468887235a6e81fc1c02.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/6028117814.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/58878197671.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/30824350978.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-7-28/20210728193607351119.pdfIn PDF document text
    • http://guilfordvikingsclassof81.com/clients/4/47/479b0a304b4cdce99dfe3eda73a59016/File/gojisizibumu.pdfIn PDF document text
    • https://aashianarealty.com/file/36438661552.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc3979cb589---93715607919.pdfIn PDF document text
    • https://zakarpattya-tour.com/upload/budolezewurukirise.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085972421854---26725723200.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/dininik.pdfIn PDF document text
    • https://discovercefalu.it/_data/images/file/53546198254.pdfIn PDF document text
    • http://dorp.pl/userfiles/files/11334374415.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dab6192e6a---juxasunolas.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f06e94b845---7576927583.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/1604513776.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c394c169dfb---46409854510.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/nowuwubimodikim.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/vuwijajiguteduxel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=home+sweet+home+realty+llcPDF 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_off0000d633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD633 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE45 18460 bytes
SHA-256: 9e65360415efea87df18c4abd6a66a23b6727f8ce604fa6150714bc75fa8e58e
font_02_sfnt_off00011e46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E46 10488 bytes
SHA-256: f6ddbcd5ec5b44876e6b698ef6574620b7fbff4a0aad132067a53773ea717f67

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