Malicious PDF — malware analysis report

Static analysis result for SHA-256 92acb78628c9c843…

MALICIOUS

PDF

72.8 KB Created: 2021-09-14 12:33:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 861a0b7ec373ab18afccd252bee32f57 SHA-1: 50862d58c1ddd64d191316c8adbf0fda22ac1f9e SHA-256: 92acb78628c9c8434c6534742985f6383ec18962e71a295ff9423f5487742871
176 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains a link farm pointing to various domains, some of which are hosted on compromised CMS upload storage. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the structure and URL patterns suggest a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://redigonda.it/userfiles/files/patipiteliwivijigonuboz.pdf In PDF document text
    • http://myphamasia.net/upload/files/27275765975.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/99008703621.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/41082643430.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/16124178680.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161343dd06aeba---jenur.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130000922606---momiboxogepizel.pdfIn PDF document text
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/tajufesedasenudivoluda.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/tuwikadoro.pdfIn PDF document text
    • https://epgeptech.hu/ckfinder/userfiles/files/durudetabiromopevererixek.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/55061405840.pdfIn PDF document text
    • http://sinorarechem.com/upload/files/51884215664.pdfIn PDF document text
    • http://balaton.varosom.hu/userfiles/files/93817489071.pdfIn PDF document text
    • http://sro52.ru/uploads/files/59300524697.pdfIn PDF document text
    • http://odra.cycling-recycling.eu/imgturysta/files/8809805254.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/73699369282.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/jazujenuwuxoriwaloxi.pdfIn PDF document text
    • http://opuspointpartner.com/ckfinder/userfiles/files/39943209118.pdfIn PDF document text
    • https://tepatsasaran.com/contents/files/96851144403.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/71329a8e926a968d3ea173da88484b6c/63690968817.pdfIn PDF document text
    • http://gelateriacool.it/userfiles/files/zepelubipupuwegixibig.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/69620464048.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=instagram+likes+free+apk+downloadPDF 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_off0000b803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB803 10968 bytes
SHA-256: 56c5864dc6d045b6541482739b6618c0c273c53cf17a0f2f0793ed17d64b6c89
font_01_sfnt_off0000d140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD140 17320 bytes
SHA-256: e31494436ce5146a74d0353a00d550fbc6162928934020ee80d8c712cb3227c0
font_02_sfnt_off0000fd8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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