Malicious PDF — malware analysis report

Static analysis result for SHA-256 63aaa4554586ad8e…

MALICIOUS

PDF

104.3 KB Created: 2021-08-13 13:45:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: cd606fa29c2e3b8c634d2345e0f12425 SHA-1: ce371bfce4e46b58447b2dcc1e28748c629e7300 SHA-256: 63aaa4554586ad8e0b789983a3bc889f11fe93bb980b18d274d4e67aaa89aaba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to potentially compromised WordPress upload directories, indicating a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/53c848cbaa2b1851ce832a5f5af261d4/zenelepasigerudanaro.pdf In PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/135809322e01cbf2c1a02d911380a375/58031555925.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/govozetokuzotaline.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082b620db5c1---707139658.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161153833699f8---rezilizabinezame.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/xolekatogewotarubogife.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e91dd9ee73e---pugopasul.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/batifomebediguji.pdfIn PDF document text
    • https://pabrikangka.com/contents//files/83397635221.pdfIn PDF document text
    • http://old.smartplus.pl/ckfinder/userfiles/files/39907417167.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/8efsokslso6lgi14oko0uesko1/pawufuzi.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d93457568---94491240997.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/04a2366fbd7864b9825a8c6a2a70ef40/pavipesofalimagewumopak.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/68187085246.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb987922fc9---36995076275.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/u1672gagphkp15p091j3s4d736/nobimunagusosata.pdfIn PDF document text
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/1lr8je8l0a17vjffa7ibjncto7/20444378344.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/f7076cbcee3c821d60a737fe96565e71/japizafagoni.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/aeaa3a9e6148fd2ccbf8f50302744b52/boliladaxafujapu.pdfIn PDF document text
    • http://beiks.info/public/file/8940426376.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/33b84ea1e59a6c856b288f3e267840b3/varof.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/16112197231.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/ligipen.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/d75317d81810fc5233deae175f82ddd9/23938463600.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=employment+investigation+terms+of+reference+templatePDF 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_off000133de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133DE 10984 bytes
SHA-256: 1c796a6fc3ea31054133524a6ca194fe27cdc0f3684394980b2fb8ae25604467
font_01_sfnt_off00014d6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D6B 17304 bytes
SHA-256: 604093ff217d21bfb2de5bfb85d0de367edfb2448dca97962cdad65924ae6ea1
font_02_sfnt_off00017aa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17AA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1