Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f071018568132d0…

MALICIOUS

PDF

81.7 KB Created: 2021-09-09 01:56:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6d9b4ac264e388222a1e196d3c741b6c SHA-1: ddd7632cf4cbcd5505503c22c969652e4dad81b2 SHA-256: 8f071018568132d0fb87ba24c8c59521900e7271fe07349f8281a8f8379402df
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple links to external PDFs hosted on various websites, some of which appear to be compromised CMS uploads. The 'SE_CLICKFIX' heuristic indicates the document likely instructs the user to execute a command, a common tactic for social engineering attacks to bypass security measures and download further malicious content. The presence of a 'SE_DOWNLOAD_BUTTON' heuristic reinforces the lure to download a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 9

  • 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.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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.
  • 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://ownlines.com/upfiles/file/91638997159.pdf In PDF document text
    • https://panama4d.com/contents/files/49659241661.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/fifogajimizedekelex.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/69916474073.pdfIn PDF document text
    • https://kocarbon.vn/luutru/files/siminuzoxerepe.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/61831896513.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/11937108447.pdfIn PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/89967731347.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/66191392638.pdfIn PDF document text
    • https://wupaojichangjia.com/d/files/xizezumarekunarego.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/raxigixurozisolowezizu.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/7723266148.pdfIn PDF document text
    • http://tianlanlawyer.com/filespath/files/20210909060608.pdfIn PDF document text
    • https://horgaszvelem.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/11473110803.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613804fd215ab---lezegatojetefexitavok.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c994c92f0---kebegegojigoguzido.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/botopugig.pdfIn PDF document text
    • https://mokshadhamnepal.org/userfiles/files/42527465244.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613544bc28c95---40503608478.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/5571623364.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/dexizije.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff9a16e20d---51400221391.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/97384139394.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/fupurijaxijan.pdfIn PDF document text
    • https://tch.lu/files/files/wenugakewubivagok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=note+10+plus+connect+to+pcPDF 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_off0000dc87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC87 17364 bytes
SHA-256: ff760711a38e275913b5b460be0264a0b78a0d8073e5e5117d25875c02a6c512
font_01_sfnt_off00010987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10987 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001219e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1219E 10264 bytes
SHA-256: b55a68d093917a97effa95fb244449d0e30cbdb620d72c2a7fb894ee81844d3b

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