Malicious PDF — malware analysis report

Static analysis result for SHA-256 097013c33bfd3801…

MALICIOUS

PDF

92.9 KB Created: 2021-07-22 15:46:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8cb2b1e45e272e680c1d2cddc7a18de3 SHA-1: e9477300f245084aeeaf03f1e4febac0fda91c0c SHA-256: 097013c33bfd3801659c7f283759e3cb03fae7ddd1c94c5e40720ca895cfa186
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which are hosted on compromised WordPress sites or disposable domains, indicating a likely attempt to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment that it is designed to lead users to potentially harmful external resources. No scripts were extracted, but the presence of many suspicious URLs suggests a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

Heuristics 6

  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://gongotour.com/FileData/ckfinder/files/20210720_BF8690B5B0459ACB.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/6415d4a90b889ead7a5e27b68f602ecd/22952815605.pdf
    • https://journeywithmypet.com/ckfinder/userfiles/files/19262597222.pdf
    • http://shhs69reunions.com/clients/e/e9/e92da0bc0099326815942f81a5c18dfc/File/gewuzugosi.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/fsn7kpuo0k03g0dmob1281tj30/bezuzezuzivifegaberitub.pdf
    • http://podiummoda.ru/userfiles/file/visiwonurerujawim.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c26149714c8---22627595825.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c3ac01c38---95765426073.pdf
    • https://gtselect.fr/ckfinder/userfiles/files/13931162852.pdf
    • http://envigest.cz/upload/file/penazatevejaw.pdf
    • http://bestapp4u.com/admin/uploadedfiles/file/78228342045.pdf
    • http://gomientrung.vn/uploads/image/files/58453984944.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160ba3c866b5a9---47558425794.pdf
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e47b43cb3---leloduxo.pdf
    • https://ambulatorioveterinariosismondi.eu/file/lajitezufumo.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/0b50b8bbd76c2e9bd00d3b9db2b95cf3/88760534753.pdf
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/i7ip765mu4131ten9ju7gp0l96/6782876475.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b99dbb354---zufun.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b41c712d62---labewegifasubukaxumap.pdf
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/20218cbbde09b7da50a00557ba0ad149/67548351251.pdf
    • http://say-international.eu/userfiles/file/10927900664.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb9f4d074b6---89358289097.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=simple+diagram+of+heart+with+labelling
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000e9f8.bin
fe822dd0f9a98f872689f54812aa8fa6654d16f207adcace442eae3196c4f778		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE9F8 19236 bytes
font_00_sfnt_off0000d1e7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E7 16792 bytes
font_02_sfnt_off000108f7.bin
720969fa15523fe99a3471e392e72a3b4dc9810273f9cb61171fc740f1c2b4df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108F7 19792 bytes
font_03_sfnt_off00013bd8.bin
8c5a2d0b9a8f94d32bcec50108854ff83a9080168e8cca4ddce92db9ae433437		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13BD8 11076 bytes
font_04_sfnt_off0001550e.bin
e262b977184f0eb728ceca863d930acaa1460870723ca8e0eba6094317636679		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1550E 3676 bytes

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