Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf42884e08443e3b…

MALICIOUS

PDF

101.1 KB Created: 2021-09-03 06:49:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c3f177aa27c01e218af8f91fb15444f8 SHA-1: 5f092c14f663430ff4b98272819698c0eafb4c0d SHA-256: cf42884e08443e3bea144ec2690d711dec658a7d750399446adf341160a258d4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites. The presence of multiple links and the use of compromised infrastructure suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a0cb591f1---jigumumulozonijorupejuv.pdf In PDF document text
    • https://discoverthesky.it/file/92257793452.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c29d650334---41472225201.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/legataditisunu.pdfIn PDF document text
    • http://ghrnightinwhite.com/clients/7/72/721f26fb9237119891afe8d29dbdfc29/File/suruvinusu.pdfIn PDF document text
    • http://lamay.de/userfiles/file/73142755318.pdfIn PDF document text
    • http://eurekaelearning.com/upload/news/file/sidasefulotuvok.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/luwurudufuwejoket.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/zulipijaferadajunuxu.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/54740114302.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/b91db614ba4f9d5e64e3c328c6a7575d/nujokodapujegif.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086bfc9d0a0d---sinamijabuxir.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/2541abe97b5f6a3bfec155647414f4dd/wedasuposodikej.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/debigotowexer.pdfIn PDF document text
    • https://forumsevens.com/images/file/32765062315.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1611ac27ac7686---bazipotetamo.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/70464810619.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/jaxawopokulaxanaxij.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/92907632352.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210624002646.pdfIn PDF document text
    • http://starkhigh1972.com/clients/d/dd/dd83d6d7846a033806cdb512e10d7d7c/File/36257143009.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/qv84gbb2e9311b8lhtodn22r1e/ralakudesewu.pdfIn PDF document text
    • http://ikoi-es.club/yamituki-n/uploads/files/bigavowimupejomabuginaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=intensive+reading+worksheets+pdfPDF 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_off000126e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E4 18048 bytes
SHA-256: ea3c7bc58fb137091b7b4c09780e6e5d189051bb37f6dc9e8bc6bd053eb2f5d5
font_01_sfnt_off000155a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155A5 10924 bytes
SHA-256: 163658b24c30d32ab00535d228548486f47c708119a2693187f8944b90b483eb
font_02_sfnt_off00016eca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16ECA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1