Malicious PDF — malware analysis report

Static analysis result for SHA-256 45215d95d7583170…

MALICIOUS

PDF

84.1 KB Created: 2021-09-01 09:08:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3e2dc8e8332035e2ce2f509d12a06cc4 SHA-1: fc5cc90198cfe8cf95670ae1ab744be99623ba2b SHA-256: 45215d95d758317096d50b7d1f8384d36d8c3e772161890f4a60bf7de8199087
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous URLs, including one with a 'utm_term' parameter suggesting tracking, points towards phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://infrive.ru/uplcv?utm_term=fantasy+basketball+waiver+adds PDF link annotation
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210704_1D2121E5039880A6.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160726e85b8ef7---58021256611.pdfIn PDF document text
    • http://vina2002.com/uploads/files/woledifa.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/butafafebelegatebalik.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4f1536bd2---26381351246.pdfIn PDF document text
    • http://titusrelay.com/clients/e/ef/ef304ccc03541e9e6382bef5f13b0a7d/File/doxiguvelorukowufobonasob.pdfIn PDF document text
    • http://tajesink.com/Uploadfiles/files/81480528638.pdfIn PDF document text
    • http://thomasbelldescendants.com/clients/40432/File/zosiwezekowurajabujebiwez.pdfIn PDF document text
    • http://promador.pl/userfiles/file/7605103863.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a96e24729d9---sulipotabina.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210831_031758.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610481a85f527---xilitideruvotimirawobomup.pdfIn PDF document text
    • http://dashoernerboot.de/userfiles/97947576676.pdfIn PDF document text
    • https://vocembalo.ch/userfiles/file/95855655801.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af8dc4d869---91937633345.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/2082bdd32ccb2d5bb0324d5bd2be3d89/vijidob.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160848e073eb0d---kotalagexideremiwesafado.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/zazasit.pdfIn PDF document text
    • http://hmed.vn/upload/files/30152639265.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/pcr1sbiqol39cs1jhk89jrgkal/jewosiwiwawonoxirivosodib.pdfIn PDF document text
    • http://casaalu.com/luutru/files/94955179182.pdfIn PDF document text
    • https://paradigma.bg/uf/file/26347692824.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a26e275d04---xizunawofidawoberitaxibo.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a599335469d---fosafanogepepesapereje.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/iee2fatt6f58e1s76fg8rvt4dt/bimisosigov.pdfIn PDF document text
    • 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_off0000e36c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7E 17816 bytes
SHA-256: 6213aedb7b0809491a576926baf4985f6ee21998004492aa8f8196fa667e95be
font_02_sfnt_off000129c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C9 10596 bytes
SHA-256: c6b6a20f6a70ff334611c2128b9c27472356863cbe5be8c236766ec64d23961f

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