Malicious PDF — malware analysis report

Static analysis result for SHA-256 10ad027744fe8986…

MALICIOUS

PDF

80.0 KB Created: 2021-09-17 02:42:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 45f2255b1d03b8ab0af7ad543bdd60ba SHA-1: 8d49b6a4e93a4ca0ae5b29d2918ec705921b8fea SHA-256: 10ad027744fe898607dba4c26265a87974ba9855df42918a406fd47b2cc62b6b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the structure and heuristic firings point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 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.
  • 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://sergeca.com.ve/ckfinder/userfiles/files/minubokomo.pdf In PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410e5e0c1e7---3480198787.pdfIn PDF document text
    • http://prasongp.com/file_media/file_image/file/62189819447.pdfIn PDF document text
    • http://vindindex.nl/images/uploads/tijewedowoputexokuga.pdfIn PDF document text
    • http://duplisite.com/userfiles/file/84185980236.pdfIn PDF document text
    • https://nevjegyzek.eu/uploads/file/majuwisinorumasiw.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/97429024317.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/98963474153.pdfIn PDF document text
    • https://jogamiskolc.hu/ckfinder/userfiles/files/82112349035.pdfIn PDF document text
    • https://namphuctourist.com/userfiles/file/12487294657.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/cj1cl52d46384bdsnu2q4k32b7/95549028032.pdfIn PDF document text
    • https://kermiradiatoriai.lt/images/files/zumogudemelogopagelivoz.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/pudomixoxolufo.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0901/ea40243b7a5aeb804da9f9aa5084dbe5.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/63668538857.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/5c62789227bdab1d7c4faf2c08a580eb/towupefuwofotelokeban.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/b0ab0eb9c7c23ca29246d9701f708197/66533662066.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/93259323559.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/mujajorejak.pdfIn PDF document text
    • http://kahasat.cz/data/file/80676414607.pdfIn PDF document text
    • http://cuacongtudongbinhduong.com/upload/files/neraminefuzela.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=the+thinning+2+full+movie+free+onlinePDF 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_off0000d677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD677 17272 bytes
SHA-256: 417da1882d1e3861ed710edf0fb0f9a285b975331965c62f09209767212046c8
font_01_sfnt_off0001029f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029F 10580 bytes
SHA-256: 6914426385d8c642bbfb24e312693d17419cb134f13a9b206b49285b0ebbfefd
font_02_sfnt_off00011aa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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