Malicious PDF — malware analysis report

Static analysis result for SHA-256 95ce93cb454ff1b5…

MALICIOUS

PDF

82.9 KB Created: 2021-06-30 07:26:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bc0eb1327e9012d4d26595a3085b5274 SHA-1: e999a164c3c65a937e78c605e0f2032291b72155 SHA-256: 95ce93cb454ff1b59499ac9fd89cf1be8c1baa92580d8849d664b13afffb68d0
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to compromised WordPress sites. The ML classifier also flagged this PDF as malicious with high confidence. The presence of numerous links on potentially compromised infrastructure suggests an attempt to distribute malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 5

  • 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://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/26155258814.pdf
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/ormmvfc5hpftj9en6f4droit1i/55996734579.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160876c9d0a31e---tudanopejeripu.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9841aa9989---zetutipetozinediwufa.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077258ba05e6---37816110237.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6e828676b---22324812634.pdf
    • https://eventaipei.com/upload/files/mosezifejinux.pdf
    • https://euroroma-bg.org/files/file/92913402652.pdf
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e6a92f96b---bibobatafivixeferesu.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec6dd92809---48256687338.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd587832ef2---sawufobogove.pdf
    • https://skvacations.com/userfiles/file/90412832277.pdf
    • https://acryl-bg.com/userfiles/file/sudomotimaviluz.pdf
    • https://aimtronu.org/userfiles/file/bitiwijodabovigovi.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606d647ed377a---vuxiwosofewekerabokitiz.pdf
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/74a06205b8fb943e319970465626000b/89334439635.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ovmnurbskhba5oggdd0pk778v2/93347519665.pdf
    • http://netmutum.com/userfiles/file/matosiwojelit.pdf
    • https://mygoaltv.com/ipp/images/uploads/files/69694258283.pdf
    • http://apluskleaning.com/admin/images/file/70059029912.pdf
    • http://teraval.cz/res/file/20616208992.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=notary+services+navy+federal
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e131.bin
d438589f748961876dcdc270822b6e37295375ed11f525ff0d2b8bdd5152830e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE131 17320 bytes
font_01_sfnt_off00010e50.bin
12b089fc19583eeb6add0997ba2a06c95c37d9b3c3b1058fdfdac995b0ed47a5
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E50 10624 bytes
font_02_sfnt_off000126cf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x126CF 16792 bytes