Malicious PDF — malware analysis report

Static analysis result for SHA-256 19a861fe60ed7c7d…

MALICIOUS

PDF

71.1 KB Created: 2021-09-23 13:32:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a39f91ae09e8978d8475fcf633a895a4 SHA-1: b6a6eb0342abeca467c89e42b36f91ab68b1ee1b SHA-256: 19a861fe60ed7c7d379c3507601c176091c60c930dbfa646b4443fb8399b83b2
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution campaign. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, indicating the PDF is used as a lure to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://oniceh.ru/uplcv?utm_term=4k+video+editor+mod+apk
    • https://produktybhp.pl/pliki_user/File/kakepemexelosivemude.pdf
    • https://r4binsh4h9-att.com/contents/files/52541593059.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/161317a16b2c7e---wevuwosemo.pdf
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_23_03_12_34_6153.pdf
    • http://jadeite.ru/images/file/88659696809.pdf
    • http://asfalon.com/__files/file/pirifamobem.pdf
    • http://myucpb.com/userfiles/file/mewagakepulose.pdf
    • http://519pf.com/userfiles/files/mepuraluxoxav.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16138e49ebd536---guvuwatiroxomagituma.pdf
    • https://get-insurance.in/ckfinder/userfiles/files/giguxobixojideweka.pdf
    • http://gartenbaukoeln.de/uploads/files/rugarakaveruzinitemaxowe.pdf
    • http://boldogelet.hu/media/33081475490.pdf
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210923143747.pdf
    • http://tourbusan.net/FileData/ckfinder/files/20210906_6068A43C0D32D3E2.pdf
    • https://haysalon.com/public_html/userfiles/file/rurezesitanatagerarutabeg.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365ce822de6---21773198094.pdf
    • https://marljivo.hr/userfiles/file/84817541121.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614acb8204f4c---23622691290.pdf
    • http://hbaoge.com/upload/files/rogiga.pdf
    • https://istruttorecinofilo.it/userfiles/file/xopufutitobegu.pdf
    • http://odnoklassniki-files.ru/images/uploads/files/47074481672.pdf
    • http://weorderfood.com/uploads/files/mifokoredolesexoz.pdf
    • http://shinaval.ru/userfiles/file/66171649224.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b393.bin
88fc3225bca3fb13af3cf4d0139e0982e064ab8ccf6889ae065f214b25e6ee9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB393 10376 bytes
font_01_sfnt_off0000cb0d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB0D 16792 bytes
font_02_sfnt_off0000e31f.bin
ea7f8e04e5bfff1dfe1a2d6cf8e2d139521c472ea9d906b4671e71d43216a67e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE31F 16320 bytes

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