Malicious PDF — malware analysis report

Static analysis result for SHA-256 019bd9cee9ba98bb…

MALICIOUS

PDF

92.2 KB Created: 2021-07-06 08:50:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4094dd340479a698725a0e168bf27df3 SHA-1: 508303da0e850fe19145b5e981fb868d21859d9a SHA-256: 019bd9cee9ba98bb058e838933cec03728c9959f559670d3ebd011c8e8bdb7a8
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple potentially compromised or malicious domains, as evidenced by the PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics. The embedded URLs suggest an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://tidaksusah.com/contents//files/74914360310.pdf
    • http://modellszerviz.hu/userfiles/file/2594854330.pdf
    • http://ttmplus.com/userfiles/files/91406803067.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b8a84ae63---61459164247.pdf
    • http://wsystem.sk/userfiles/files/30177320647.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b57a739287f---tizow.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/qvfgcmvkpc7g4hjapsqa68ivi4/gobojabugab.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088ce6b5597b---fexiloruzox.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b3a39751c---mijunerurolexadosepaf.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608316c884651---riwag.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/a42143adb957772e7a29954e470f6f06/88112308019.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16091f4bd836eb---nexusutibomadolapuzover.pdf
    • http://high-keenltd.com/userfiles/file/35988293907.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16073695f6b30c---36323947709.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/b447bd1bfd4714cc8090d945c0cb8b66/wumonejeduwifu.pdf
    • https://hojoairport.com/images/file/kelumavudededuge.pdf
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/2f606e5b63460a3f44d5a0e66e91d135/57015675002.pdf
    • https://carrieres-pierre.com/userfiles/file/79088707425.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7e1a6aa99---levobazojafev.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/o6eh40dodq451hh27i0bk3br60/97338904292.pdf
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/7584c97384d6a28fe784198fbffcae43/tikovejakopomaki.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16090d7be0a146---medezodamo.pdf
    • http://gialtour.it/themes/userfiles//files/17269876267.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=ruth+life+in+the+bible
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00014582.bin
a82b0f73036e77099328b53d32e4aa6f14ecf965a63b19ac91e0a2637f7ebd22		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14582 18656 bytes
font_00_sfnt_off0000eb4e.bin
cfcd201e7c5bd24a6a3f63de3ab48fcef31ab675ca527e1c3cb02bc7eeb91a4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4E 10048 bytes
font_01_sfnt_off00010185.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10185 16792 bytes
font_02_sfnt_off00011997.bin
c992304c05c38f65577701cbe72e18c4f3e9298176d7a7f544eb9a7fa40b34a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11997 17036 bytes

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