Malicious PDF — malware analysis report

Static analysis result for SHA-256 35afb44cdb15590b…

MALICIOUS

PDF

62.4 KB Created: 2021-08-16 05:43:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 869ce41ed79bd8cc922b47c276765807 SHA-1: a9dde3b91e870e3c3ddafec5ae53f8d857108ca1 SHA-256: 35afb44cdb15590bbf20c3c0cf1d04fbfcfd8cb6498eb742522168464f8d12cd
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to WordPress installations that appear to be compromised or misused for hosting PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm on disposable hosting and a UTM parameter in one URL suggests a campaign aimed at driving traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7892

Heuristics 5

  • 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
  • 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://laborke.ru/uplcv?utm_term=fun+run+online+hacks+2020 PDF link annotation
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16119c8ec90bcc---torerulo.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/47105612255.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/kemedolaj.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caf2f3180b---20844199908.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/b892e532e794ea028c8fb377f42a253c/92324568125.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e524423a31e---15865862040.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea3f04f45e---38123139580.pdfIn PDF document text
    • http://kath-kiga-bw.de/bilder/berichte/file/zuwimaporu.pdfIn PDF document text
    • http://sodrex.pl/userfiles/file/13415809710.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/lukusonodadijodat.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/kabenenekawut.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/xefemusam.pdfIn PDF document text
    • https://best-label.com/upload/files/75742365829.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/19526286401.pdfIn PDF document text
    • http://leaders-adv.net/userfiles/file/rejexujozelukobibedilaxun.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/xikowiw.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/hgvfibmjh6ed1sdhsa4jpskegh/75065173750.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/dcb48c9117eddfe85e3db637c9550fe5/42341243572.pdfIn PDF document text
    • https://schilderlesvakantie.nl/ckfinder/userfiles/files/puputoxijujununiwip.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/92772318472.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/54882306034.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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