Malicious PDF — malware analysis report

Static analysis result for SHA-256 cedf36fd6780997c…

MALICIOUS

PDF

83.9 KB Created: 2021-09-19 08:01:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: cc2c6f2953bd7b3a268de5fe51d82541 SHA-1: 3fbd4664de609a652fd6955da40139465e41209a SHA-256: cedf36fd6780997c3d833ef9b15364a740d2df5fbc402d662502ae2f5687ed4d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 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.
  • 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://pistant.ru/uplcv?utm_term=fire+red+origins+download PDF link annotation
    • http://dija.lv/public/userfiles/file/kizuveguzewuzuboj.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/pewuweru.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/30047996914.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/luzatap.pdfIn PDF document text
    • http://yey.uw52.com/upload/files/96456425895.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/c9b83205bd741b2704273d4b6fa92acb/38152991263.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e858903e99---boduvujupejujewudovixomu.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/bapojirafowatetudugogowu.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/88785923291.pdfIn PDF document text
    • http://mptech.vn/ckfinder/userfiles/files/85429153944.pdfIn PDF document text
    • http://riwg.in/userfiles/file/84391080717.pdfIn PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/fafakerofowafovujenox.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/bilomupelazo.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/junewu.pdfIn PDF document text
    • http://swhos.com/upload/files/97722826977.pdfIn PDF document text
    • https://flomogroup.com/upload/files/34415925753.pdfIn PDF document text
    • http://d2dgroup.net/upload/files/9086518216.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130562236cb0---dipotuluzejunutetisofakon.pdfIn PDF document text
    • https://voxel-avocats.fr/uploads/file/In PDF document text
    • https://samajsutra.com/userfiles/files/muxirubaxa.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/53386265273.pdfIn PDF document text
    • http://etepi.pt/js/ckfinder/userfiles/files/99870713054.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/32472633044.pdfIn PDF document text
    • https://combrooncom.com/contents/files/69185591298.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/melaxatirikug.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_off0000e259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE259 10388 bytes
SHA-256: 12ff6c4a702db74f19aa1c076bfa54d91a4bf98c19ba88f4bb4993c949f1cd81
font_01_sfnt_off0000f9c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C1 18008 bytes
SHA-256: c59c4bdaf7ddb5c4ba2f7494e8db563546fece1e9c1e4d7320d42312002ba4a0
font_02_sfnt_off00012839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12839 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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