Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f30d4740bd58212…

MALICIOUS

PDF

79.4 KB Created: 2021-09-03 14:57:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7e0a516d9818c4542261100ebd2ca729 SHA-1: 6617738be102b74c2659240dbb0bc93ed4fd799d SHA-256: 5f30d4740bd58212e98088bf8081ea51e13582eff82f7e273d009b4b664e2dd1
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan-like behavior. The document functions as a link farm, with numerous embedded URLs pointing to various websites, some of which are hosted on compromised CMS platforms. The primary attack pattern involves luring users to click on these links, potentially leading to further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • 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.
  • 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://irish-setter-zucht.info/ckfinder/userfiles/files/15189459329.pdf In PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/zedod.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/jjmgp6kqgvqup4lvjbp0verlou/jafuvolanu.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/57991925567.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/161091ee91bf78---6955909189.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/n5ut4i72dn30lbisrs7s39n1va/mitovamiv.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/68c5c58921c9a7ae119e977d39a18744/32500184375.pdfIn PDF document text
    • http://deryalvincotokurtarma.com/userfiles/file/51536876528.pdfIn PDF document text
    • http://www.sealjet.mn/pictures/files/33891292568.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/060e246e7c450671d4b156f3801c798b/guzego.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afce1279865---46315639545.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769351982b5---viguxaxijaxefixipo.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/l57qiav4ed8p7hpbm473kb6717/garipa.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/ae1edd90df8824b7b84055c7c182fc0d/lobabetezepoxe.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/572845339.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/64773441495.pdfIn PDF document text
    • https://lanjutpt1.com/contents//files/pabufa.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/58982539483.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/531fa30a4c6c3a02c5e76f4af03bf93f/46626639782.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/80804181810.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/5fmeleqgjnh9o8jdoa24587cav/65532342971.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/107c8f907ef2c7b54436308b8f8ee685/kigimodufal.pdfIn PDF document text
    • http://tweedehandswikkelaar.nl/app/webroot/files/userfiles/files/81194392017.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/15235194641.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610836385086a---98813057470.pdfIn PDF document text
    • https://buyafranchise.org/files/files/76106466619.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/napeximodokubosideba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=apple+ipod+nano+manual+7th+generationPDF 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_off0000d1d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D1 17396 bytes
SHA-256: a5d357b025d5812020a4e48f22c1fe9d81c7796079eac2f301adff87212ed685
font_01_sfnt_off0000ff34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001174b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1174B 10804 bytes
SHA-256: 5017d7b98e028cda5cf09f87ea5a66e87eada06e61f6c10eb9743d8f54c870c2

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