Malicious PDF — malware analysis report

Static analysis result for SHA-256 63655a6ba4ba6d59…

MALICIOUS

PDF

73.1 KB Created: 2021-10-04 00:50:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 052d7de31d341a29fbe73babc1676786 SHA-1: d346a8a6b732ce1360705c68b1a6a9e42cafe058 SHA-256: 63655a6ba4ba6d59ed62eb3f91c20c24b590be6f02de0cf0ec0ae0d81504650a
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads or disposable domains. The presence of external URIs and the overall structure suggest an attempt to redirect users to potentially harmful content, aligning with phishing or SEO-based malicious campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://kepco-group.com/uploaded_files/userfiles/files/radap.pdf In PDF document text
    • http://ultraljud.nu/bild/files/fisipawekaxi.pdfIn PDF document text
    • https://iaido-iaijutsu.ru/userfiles_exc/bibezurukedepizisajosoxa.pdfIn PDF document text
    • http://om-ar.com/userfiles/file/viboz.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210916182911.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/gusisopiva.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355f8e005b6---46369403820.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/72502051793.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16155e804144ad---46956702278.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/wuwewefabenimigasefot.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/14125362465.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/girunaxelakim.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210913101034.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/kobefop.pdfIn PDF document text
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/32621516194.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/96679632122.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/ladebuzepepepusufejuregi.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/88229333006.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144e8de784b7---wodigu.pdfIn PDF document text
    • https://ms2gacor.com/contents/files/23196370.pdfIn PDF document text
    • http://laserbeautymachine.net/d/files/tumeb.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161424bb92d5eb---xetux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=granny+horror+game+online+free+play+unblockedPDF 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_off0000b2f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2F0 18728 bytes
SHA-256: 2e3c153d581a4b51f027695eba1fa68b6adcc490630ef5cecef7693d2f180990
font_01_sfnt_off0000e32e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32E 11284 bytes
SHA-256: 9067d5fb84fefed28a579adb13485dad6ded6b03fbd642066fe719127440458f
font_02_sfnt_off0000fd0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1