Malicious PDF — malware analysis report

Static analysis result for SHA-256 87f7f0536e17ce5a…

MALICIOUS

PDF

94.3 KB Created: 2021-07-02 23:12:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: a1aa2f86af394ede659b9add1a37572d SHA-1: 3856b51c1f5dfcd614071fc1eee6d73c8f08ecf5 SHA-256: 87f7f0536e17ce5a9ca66d79b4e3d349f38c0b3bc94f135d93eda3f536935f61
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://archism.ru/uplcv?utm_term=eviction+notice+template+south+africa PDF link annotation
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/3mtj32bpom3so8po6281usjp5k/nusewunorudezikemunili.pdfIn PDF document text
    • https://superpart.com/files/gotofigusegusoxopejudid.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/gezazexabefazoguzelipal.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160bf536754f54---62569401225.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b49a96014---30401123611.pdfIn PDF document text
    • https://luminex.pl/upload/file/75195893678.pdfIn PDF document text
    • http://www.tekkoo.net/images/library/File/19162831347.pdfIn PDF document text
    • http://vhktn.at/images/content/files/zisizimojodemezotasapiz.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/46215313069.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a70d58aa67a---61620727310.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c000432a583---porukumosakokar.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b72da1378ce---20079115907.pdfIn PDF document text
    • https://uniqrelation.com/userfiles/file/fuzibofurafapabamo.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/402a1e339636cc9ecb312fefda684f21/pugumezokanaga.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/bitifivitogozafozejurefe.pdfIn PDF document text
    • https://cupanghitam.com/contents//files/xawamunuge.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a7627f3604c---gokofifokawex.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/kfqoc3jjrjkajf7pit5i841u7k/jurujezipaxotogemiruga.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160726404b6dca---96668712396.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080ce022399d---34845873128.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/54267089208.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b45fb1d19b0---77940579692.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///pesoxepuwogosuvikufuxix.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_off00010c02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C02 10892 bytes
SHA-256: 06aa713cad54bab3dfb723fa61b892c76122e85b50ba0eebadc1429b825c6d62
font_01_sfnt_off00012505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12505 17092 bytes
SHA-256: 83f543b24d3d052d0d808b0391cbb704f4b3429a637dc12c067e6fc30d999a1b
font_02_sfnt_off000151eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1