Malicious PDF — malware analysis report

Static analysis result for SHA-256 7894216c5c522547…

MALICIOUS

PDF

91.7 KB Created: 2021-08-14 08:05:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 89997efd513235014f6a95c6a132e1b6 SHA-1: 9ad9ff66eadddcca765073a993b7867e7b9d5f7b SHA-256: 7894216c5c522547e69bad1ff9843654f0370811c96655ba2f2bda331903d8db
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised CMS upload directories. These links likely serve as lures to phishing sites or downloaders for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/b786f934d9980c1de800e999169c5f83/32001747879.pdf In PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/560e373be27b9702ace06584b5fed645/97015477135.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2ddc339a7---sisanilepisunivuguletije.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a49ce9f127e---900488640.pdfIn PDF document text
    • https://qqhanoman.com/contents//files/75431802741.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/sogixefana.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/99789350371.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/55996ad6fb07579c23b6c7b065259dc4/94718158565.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/edac43e5f2704f4f1bbc065f63c1f715/somazilirotasekujaseguje.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/3u332i0n9c900n641g1nl5vdkv/dazitefak.pdfIn PDF document text
    • http://septumdent.com/img/userfiles/files/47754369989.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/nowiwibi.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/kaneruwomoli.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a4bcdb663eb9ade67d264d33272424be/69096464438.pdfIn PDF document text
    • http://dooroc.com/tk/upload/file/fosexeteworumizurovilolag.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/gagos.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aabad5774e9---jewasoto.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/s3f2k00bbot211i7essk9h0bir/27089708124.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f17a4f8f045---6106549149.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7180901ee---gitenupirome.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/jugotepunisusosefomuwodab.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/e65b1f5ac0989e69d8e6a86ace13aa49/futurubiloxagomaxuna.pdfIn PDF document text
    • http://videotour24.com/data/fckupload/file/detukanewidukezelufis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+decide+electrical+cable+sizePDF 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_off00010265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10265 17144 bytes
SHA-256: ccb11bed8a93e476d94cc75625fd83da63f2aca39ac59e56a5428049174b9d6e
font_01_sfnt_off00012f0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14722 10536 bytes
SHA-256: 9d959e7cb341774facb0637212555bbecb58ee8159c82e645c6eb4618f8d3c05