Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0baea53aea38b56…

MALICIOUS

PDF

131.4 KB Created: 2021-08-05 07:46:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 82126af1c42a5592936fe7e73ab0a8fd SHA-1: adb8fa7e35f897165b644d8c725e3e32091ea95d SHA-256: b0baea53aea38b5618ea08684b9b0793a1cd1c20c80d3d16937207452359c7d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Multiple heuristics point to the PDF acting as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites. The embedded URLs suggest a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://irlanc.ru/uplcv?utm_term=fox+sports+1+optimum PDF link annotation
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea131a310d---rotaduje.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/20485358422.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/vovilemupuvusiserupiw.pdfIn PDF document text
    • https://mastirz.com/userfiles/files/79318542139.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/hmuagdin3gc9muv7e4rcgru342/59798019254.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/kirerunegobuzujuzilur.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/kukilifabamisezudazodem.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca8d19ebcb---darazelexamika.pdfIn PDF document text
    • https://www.speeddating.lt/speeddating/ckfinder/userfiles/files/74494889821.pdfIn PDF document text
    • http://balone.net/_upload/file///pefepitubilomupakudufugo.pdfIn PDF document text
    • http://traviet36.com/upload/files/76499463944.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/ujrkv2lfvteggnqcn0g974m0rg/99105598006.pdfIn PDF document text
    • http://consorzio-csa.it/userfiles/files/zufapulofufubilinosep.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/23b4c948e4e38b925687bdf99b48cb52/55708188237.pdfIn PDF document text
    • https://prairieroseclothiers.com/FCKeditor/file/75297245283.pdfIn PDF document text
    • http://princeverma.in/uploads/files/60034033926.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608309bfd7826---67883127187.pdfIn PDF document text
    • http://architettosirocco.it/userfiles/files/sevetuwerumatezegovefuja.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609df78a4d903---mipavoz.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd7b1e4636---69486030508.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/70687492918.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/5c16753c94f24f6c82695e32df427e51/kejiro.pdfIn PDF document text
    • http://homenet-spb.ru/userfiles/file/88988951046.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/dbe728440d16a2ea67f0441a86c5656a/foralesazawafi.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/82873127415.pdfIn PDF document text
    • 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_off00019f87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19F87 10200 bytes
SHA-256: 4df085653620b7baabba17ffc22cd73ee24d268779f0837e64a84237e92b83aa
font_01_sfnt_off0001b678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B678 18288 bytes
SHA-256: a65eee7a030ac410693d0d82c1bc5796c69c35eb6bca03ea1750bb700bf317c1
font_02_sfnt_off0001e6ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E6ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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