Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7c4dc7ff443a25f…

MALICIOUS

PDF

73.8 KB Created: 2021-09-16 13:00:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 90a3ca06074199f4c8e79e7c809e4186 SHA-1: 4453fa86259c5d010b804ced130bb371e9497629 SHA-256: a7c4dc7ff443a25fe0ff4173813cd8de808cb201b9ea2684bdd91f1ccf8994ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to external websites, some of which are hosted on compromised WordPress installations. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://brune-schmuckwerk.de/ckfinder/userfiles/files/2833299393.pdf In PDF document text
    • http://china-hold.com/UploadFile/file/20210904205054304.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/litanipomupobiza.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/292aaca69b002da590fc1859a5865fc7/nazoxodabesamubibisorise.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/13358347260.pdfIn PDF document text
    • https://futurefacesmiami.com/uploads/file/zoxasaxijalazagif.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef9cd2e774---kuponafejuz.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/595d36e356763485e1bbcf050b8eb7ef/35600498552.pdfIn PDF document text
    • http://cserepakciok.hu/xdata/file/90703460064.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/61559640338.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f60287fc25---tokoletakomowiwiverimu.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161401a8944661---riwesorojogu.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user//file/_0926232001631369060.pdfIn PDF document text
    • http://anshan56.cn/userfiles/file/16315700801950630267.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/jutufuropizuregutop.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/71340542726.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/ad379b68c4cb2e1b280e3a5c53cca231/zeromajugasezaturapeli.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///2021090634427_678993261.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/32656167589.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/18225561185.pdfIn PDF document text
    • http://realtor-madrid.com/uploades/fckeditorfile/pevanobexopomemi.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0e0e03a9d---kijinugigaxarenidoze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=onet+free+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_off0000be83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE83 10324 bytes
SHA-256: 534fd81954e6d742f20b1654eab4e644bf88bf56a08c41ca78c1e619327feef8
font_01_sfnt_off0000d5e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000edf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF5 17020 bytes
SHA-256: f8bd9ec977aaa1848af0a1300bb68941412c7b0fab714d8c0b2b989fefea2a0f

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