Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b1fbba8321f2d2f…

MALICIOUS

PDF

89.5 KB Created: 2021-07-18 08:33:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d13867900fd50679b5ebfefa85994996 SHA-1: f5314f5b9d1591a3408fea442a520b47b49ea324 SHA-256: 0b1fbba8321f2d2fd7c00e185bdcca9270f80860b6d45958c949c938a195859e
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload storage locations and other disposable hosting sites. These links likely serve as a distribution point for further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5dd5fe4ad2---wagupataladurogoxitotevot.pdf In PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/foovulnlgdvkmi2did9ur9fib1/45859616747.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/50610555786.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/b236272ef78ad82ebd9d137d4403d261/magemetiwevavuzezivus.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/wulurifuw.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160adeb636752d---zadajetob.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160823b7e5e89b---suzonopuladolonad.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/62894255300.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb5bae8338---woxukidululomek.pdfIn PDF document text
    • https://aynadakikemalizm.com/resimler/files/90475601155.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/kijilibo.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/nejiz.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098595b2d1a5---welijikilufimo.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/b7kubjkqkpgno907iqalkdsbi0/16694533589.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833a1b960a8---bavinizob.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e4da98f68---beginiz.pdfIn PDF document text
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/94582472054.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160779aff64783---wegawazarupaxidifisijojuk.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f200a5b176---40800895257.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608e175559055---vejapukurisizusetikiw.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/xenonajasopovarebabu.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/51046178703.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/0f297c4861e7d913b4bf4275e612e212/62585430740.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9a6c0b4e1---77964182095.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080cd7b649ec---gibumewevunibizutaxepakid.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/52624917645.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/9892990287.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+unlock+mario+party+mini+gamesPDF 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_off0000f76c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76C 11100 bytes
SHA-256: d84ee13eb97c0365a839dc670eb26c8c665bf06b0ad5a287ce2613d22d122f8c
font_01_sfnt_off00011153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11153 17376 bytes
SHA-256: 51392253ae94529ef49e9d7587c2a371c694094604404a2b687c6b1c55f7aa3f
font_02_sfnt_off00013edd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1