Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ebbce47b5802ac8…

MALICIOUS

PDF

78.5 KB Created: 2021-09-13 20:22:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ed41903848b6476c02a03011646f4646 SHA-1: da455f76594d06406ff21540bb5cf09373728b56 SHA-256: 7ebbce47b5802ac8660389c9e5687d6d6d5bcf21776a7d888bfe105ad3966301
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of a 'download button' heuristic further supports the lure aspect.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://aaz.sk/editor_uploads/files/93479302239.pdf In PDF document text
    • http://bamboomfi.com/htdocs/cljr/data/files/17663250676.pdfIn PDF document text
    • http://cuakeobinhduong.com/upload/files/25705816334.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16130de671d753---86277565015.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16132fe9eb8f97---97819625783.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/zewivikirobos.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/vusopavozuberoj.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133661e29e2a---31248375462.pdfIn PDF document text
    • http://myesen.life/userfiles/file/suleli.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/93942224937.pdfIn PDF document text
    • https://curvy.tw/upload/files/xepewumu.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/matuki.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/17558365859.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/siletunutowosuribeno.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/mikugefonukenefo.pdfIn PDF document text
    • http://hatdesechia.com/storage/ckfinder/files/ziliberemux.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/10313373558.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302ebaa9e33---28284478037.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/nidezutibuzo.pdfIn PDF document text
    • https://zzwgjx.com/d/files/38160529898.pdfIn PDF document text
    • https://hijaustabilo.com/contents/files/nelanejuroderujero.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/96938935626.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210902010848.pdfIn PDF document text
    • https://clove7.com/userfiles/file/tozaxapesigo.pdfIn PDF document text
    • https://olterus.net/contents/files/tumiwopodelixuro.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/valalenojuge.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=vpn+root+apkPDF 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_off0000d15b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD15B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE971 9868 bytes
SHA-256: bc1690390217e6e2d5ee69b0a481548557a78ef5cd875c64a5ada36e3e4da44e
font_02_sfnt_off0000ff4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4A 17392 bytes
SHA-256: 9d20b59dd0f17317300665b083a08b6d4bcccd221097b8e088d256f046f7778d

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