Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9c969d71eccc01c…

MALICIOUS

PDF

87.9 KB Created: 2021-07-26 11:26:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e91195cc708b0520ab941b78557bdb8e SHA-1: 9e097a78b59753a130895d1b78e0899cd88102f8 SHA-256: a9c969d71eccc01c230bf5f924fb24c8b0652e258a2818c1f61c47a56d8eada6
156 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 CMS upload storage or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://mwflower.com/upimagesfile///modopinumuduki.pdf In PDF document text
    • http://backyardreleaf.ca/clients/6/6a/6a4eaaf8452764cb6fc14c9064ed0c71/File/zodotezasit.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/17906450732.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/32716927102.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/tofawukatizurizopujasozet.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160904298b9944---poxugipi.pdfIn PDF document text
    • http://ropesadventure.com/d/files/12368119068.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/52809573935.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/shoa4ie31mcqrksoslk6blo6u1/lekov.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608af147b5436---26998972555.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9f3a0b2b9---28836756868.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe1aec7d321---85211261384.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/5612b9f19ca61c0859521f4d115e49b8/27891608355.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f712efcb1---41984464374.pdfIn PDF document text
    • http://mweb.cz/images/file/31251631101.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/gizelamuru.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/034cb581529e02d86c4e0f8b8d1ac1c5/zebodidusugifiv.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/72586b29edddaf9e5b8ce3a0566688c0/lekexirodemiviwuxis.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/tasoxumawozuzinudil.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/70308819474.pdfIn PDF document text
    • http://gdgom.com/upload/file/210710011249338160l3opa77b4yg2.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/liguvifisegetisoxanowok.pdfIn PDF document text
    • http://dhf-china.com/d/files/17310667031.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=giant+defy+1+weight+2016PDF 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_off0000f5cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CC 16660 bytes
SHA-256: 2b71a0290484ea69d6377b74e87318281e3e5bd22f907a3206331ea01ea4db4f
font_01_sfnt_off00012109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12109 10900 bytes
SHA-256: 762653398d5ea2ef4fd8e287cde7ac6f3860654ed6be14dd7c7cc14e1ffa75f9
font_02_sfnt_off00013a36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1