Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdee506cff9357ed…

MALICIOUS

PDF

81.5 KB Created: 2021-09-14 06:19:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 863bddf62bd5b4746af4f37cd897e34d SHA-1: 014ad03384dfecbeb8765a23c80e9d63dae0dcb6 SHA-256: cdee506cff9357edbaab21782b3cc772d20d7956a9071811d7ceae5e2cb9a148
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript (T1059.007) suggests the PDF is actively trying to engage with the user's browser to facilitate redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://onderhoudnlgarantie.nl/upload/file/62272263670.pdf In PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16136be6b6aeac---74456705365.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/fosikaxikamodolodasuxetux.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/54411481767.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/4423518694.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/xoxijakog.pdfIn PDF document text
    • https://eurouniversal.eu/ckfinder/userfiles/files/mawerejagafobupoxuzem.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/41969175128.pdfIn PDF document text
    • http://bouwbedrijfbouwheer.nl/userfiles/file/39955754693.pdfIn PDF document text
    • http://top-caster.com/userfiles/file/latala.pdfIn PDF document text
    • http://deccanquest.com/konadnew/userfiles/file/4330857436.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/wegojoralezosatoditujuxe.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/74265246635.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/tuditaxokupo.pdfIn PDF document text
    • https://www.santaterezinha.com.br/js/ckfinder/userfiles/files/54166960555.pdfIn PDF document text
    • http://porpora.group/imagenes/imagenes_contenidos///fipigo.pdfIn PDF document text
    • http://lapmaymn.samdigroup.vn/app/webroot/upload/files/16000095779.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/79280475295.pdfIn PDF document text
    • https://podimercrm.com/img/files/70888935099.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/87467439786.pdfIn PDF document text
    • https://diphong.com/uploads/71706102948.pdfIn PDF document text
    • http://staropolski.net/Upload/file/nododobuxawuwid.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/e58cb81f968523b3950f5d619d3d75a8/63139456976.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/a402b467ef91b93259d54c0e9d46045a/nuxap.pdfIn PDF document text
    • https://adikmanis.com/contents/files/taperapebidixitagizubig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=abcd+2+subtitlePDF 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_off0000dc53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC53 17328 bytes
SHA-256: b053ffba9ab30b1f052b7bf36ea945603749a22b387261fad6db669f97fb756a
font_01_sfnt_off00010912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10912 10216 bytes
SHA-256: d8d7f18e88e67814064cec812d92f963950f69a895bbc934a871f4934baa548d
font_02_sfnt_off0001203a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1203A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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