Malicious PDF — malware analysis report

Static analysis result for SHA-256 c22ad1b4dfb54aa3…

MALICIOUS

PDF

69.2 KB Created: 2021-09-28 00:44:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 5abe249fa1273941df872a59a9c4b57c SHA-1: d20be16689959a91a39d6b69747ebc88bb9c0fa8 SHA-256: c22ad1b4dfb54aa33f8b307a452d994a767917fc192a4995f8d4ccbccb783fd9
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. Heuristics indicate the document functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 http://remaining-mc.de/userfiles/file/nikarufimefuligudeg.pdf In PDF document text
    • http://thanhcongtechtra.com/upload/files/vodedepefevunisibiwok.pdfIn PDF document text
    • https://bongkartuantakur.com/contents/files/zuvor.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/25256be85d1f7330ad54a1b7a4781150/difuwopibix.pdfIn PDF document text
    • https://lnpro.in/ckfinder/userfiles/files/pokavaxexuturalovusun.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/lozirakipase.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/suzazobawusa.pdfIn PDF document text
    • http://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/pupikazugidoduvumo.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/089cdeec533c3dafd17282967c80f51b/butinawasumuku.pdfIn PDF document text
    • https://mentormedya.com/files/32550689018.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/davifupilelamipijogudig.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/98685157453.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/59474101832.pdfIn PDF document text
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/sajarugalexosegawesexatu.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/vomojuxo.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/16635040996.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202109231436077463.pdfIn PDF document text
    • https://pansky.ru/UserFiles/File/65756604344.pdfIn PDF document text
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles/files/rojomiduriletexosepaf.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/97450319579.pdfIn PDF document text
    • https://tanthueviet.vn/img_data/files/katekezanujijewudojaro.pdfIn PDF document text
    • https://dom4m.com/userfiles/files/ragovuputujomojuwenaf.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba09152d72---taruxolagupejita.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e46c98c7f---82547446561.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/9868772853.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+to+clear+storage+on+cell+phonePDF 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_off0000b09d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB09D 10640 bytes
SHA-256: 2db320b11fd44940de19402cf440bbe6efa63988b190a2aadada927fccd9d06f
font_01_sfnt_off0000c8f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F4 15000 bytes
SHA-256: 51954e1387710fd10626bd7f4b25813ff9b89a7bb423c7dbe0297ad12ee60e3d
font_02_sfnt_off0000eef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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