Malicious PDF — malware analysis report

Static analysis result for SHA-256 571232ff41a3edae…

MALICIOUS

PDF

81.8 KB Created: 2021-09-02 13:43:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 9f5a61e5f0315b2ad60e656ebfd8ea33 SHA-1: ab55ca74a0b1226f2a5728f66cf976b2a29ca838 SHA-256: 571232ff41a3edae19bc931c1e64e23209174303767d9427565d6a3d3c7154b8
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by 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 0.9960

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 https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e4fdf31c88b---xisiramuxesavaxasifumos.pdf In PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1be2311a4---63085424636.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/resopudekazemifakobuxuxuj.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160cab9e948e92---disodiguzepasamuke.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/60115050353.pdfIn PDF document text
    • http://webbyshoe.com/fckeditor/userfiles/file/90424992050.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/66fd060d11d9866ef87b0cc5b4785622/25133907825.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e2d655c08---87989042785.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/majazaledamej.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/63080254600.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/6560541441.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/99214c98368fe4a5f93532d2224ada7c/gopitobafemalipifoxox.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d5557b1ee---59684338219.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/65086316158.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b488d8cacac---53169280589.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16125ffb196030---melitokepavusasilebodab.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/bosokibivifomokabudope.pdfIn PDF document text
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/23928366111.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/4ad202070d71a3c6b0f42ab5f02f3645/72533758442.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086be7921daa---tonoro.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/mopulexafunerixelepaw.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/e7661c0b8cbea01009e771cd016f070c/riwibulixumesatuleloleraj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=s%C3%A1ch+dung+sai+l%E1%BA%AFp+gh%C3%A9p+ninh+%C4%91%E1%BB%A9c+t%E1%BB%91n+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c96b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC96B 31368 bytes
SHA-256: 0063636632ba95ea3ed8230d791e6dc1ec4e31edbb94ac63efc1729022edf661
font_01_sfnt_off00010499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10499 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB0 11808 bytes
SHA-256: 29686cde45f3bccaac02f94680b59c22c7a611afd8fd26edd80af6b277e95d60

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