Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c55e94a77a6244c…

MALICIOUS

PDF

69.2 KB Created: 2021-09-04 19:59:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 76674787b610bd84e35cacf99fb4b8df SHA-1: 2292cfea316e9d6bae94cde63ce6a65bc76d370b SHA-256: 8c55e94a77a6244cd118709cb1d254a34beedd527a010dbffa45fdba95a54540
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to obscure the ultimate destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8831

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://drafthe.ru/uplcv?utm_term=tell+me+about+yourself+interview+question+for+experienced+person+pdf PDF link annotation
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160f0f7e99ff1b---35719128800.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/19279985227.pdfIn PDF document text
    • http://modern-pro.ru/files/file/gofofonubevopomosune.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f45f78efc4---divewutawupesuzunovoxo.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae51bf2b9be---bipifujisekot.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/luzinobizutegixusubo.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/garizibedamo.pdfIn PDF document text
    • http://photou.cc//ckfinder/userfiles/files/33832534248.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a94e8b56d14---fulavivel.pdfIn PDF document text
    • http://elitacasa.it/images/file/mefukuwopo.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/pokewejokimefaramaf.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089396102959---zifuzijamakutasekofej.pdfIn PDF document text
    • https://0924055971.com/uploads/files/202108231233347047.pdfIn PDF document text
    • http://africalegal.nl/userfiles/file/91856243750.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160898a08921d8---tovixomelux.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/27303670638.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110d7d730d20---27721582282.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/46792328516.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210628094511598.pdfIn PDF document text
    • https://profitaler.com/UserFiles/file/birereromejuli.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097e224b6bc7---pevesajinawodezojawexijom.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/sogagikuwewugaxewenikaxis.pdfIn PDF document text
    • https://ppkh.net/userfiles/file/wugotawasajolaxoduvobop.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0f25a6dc9---54541830437.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/70621454993.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16075c0c9b58c4---48118905923.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_off0000eade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADE 16788 bytes
SHA-256: b5f37b27480a2f7e81c0b7eb0c47f5b21310778ac6853ea8336aba233bc9c67f