Malicious PDF — malware analysis report

Static analysis result for SHA-256 9720f13eb93fd537…

MALICIOUS

PDF

79.2 KB Created: 2021-09-19 13:07:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0e37d5e44cd2d4df10a22c43a5ab7d50 SHA-1: d717359f033adf1c49f9d59baa88ed8755ea0919 SHA-256: 9720f13eb93fd5376e31497fcce9a7a150686e39f7c2738354d57c5f65f151a8
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable hosting. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, along with ClamAV detection as Pdf.Phishing.Trojan, strongly indicates a phishing or malware distribution attempt. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://queure.ru/uplcv?utm_term=download+game+pokemon+ds PDF link annotation
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/mufizanuvesede.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/66604030558.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/38444781645.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/kesivexamosejavu.pdfIn PDF document text
    • https://frisch.ro/files/file/maratalosoduwago.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/nowez.pdfIn PDF document text
    • https://gkscam.com/userfiles/file/56680652942.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/it4s037qgmvr8sr9gco391f7lt/20184721846.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e332d068c8---zewidaliwufaw.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210908_875FB6193378DE40.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/rojenurevimedegovivuso.pdfIn PDF document text
    • http://spzpoz-zdunskawola.pl/upload/file/lotosokidusujivebujuro.pdfIn PDF document text
    • http://liceoadultos.juniorcollege.cl/userfiles/files/11739641776.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/88084377881.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/kepelanimerajumofaxo.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/1147000187.pdfIn PDF document text
    • https://lockerova.eu/admin/upload/documents/tudub.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/gunamixuzozifigu.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/79722753514.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/femuv.pdfIn PDF document text
    • https://asken.as/bilder/file/tolebinukerunebe.pdfIn PDF document text
    • http://1666-3668.com/attach/userfiles/file/18045904061.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16141e2bcb65c0---xazogutipimol.pdfIn PDF document text
    • 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_off0000ceec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEEC 18428 bytes
SHA-256: bd1ff686d043218f2ecefffb3a1ec67e9f6b9a1cfec704d246e70aff1ef63217
font_01_sfnt_off0000ff50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11767 10624 bytes
SHA-256: 54ebb3a0231a8dc1a12749ebe29954e924828defcbb03df5126556c75adf2946

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