Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6fe0362a48dede6…

MALICIOUS

PDF

95.1 KB Created: 2021-06-29 02:01:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0617701c4bc20486d2d6dd50ed5589bc SHA-1: d90e0c7f5eb8e014fb0194244359a4669935fea5 SHA-256: b6fe0362a48dede64715d1f6447b9edbdf7e8c48f1483e7b64c9e83ecb63a66a
96 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier strongly indicated maliciousness, and the overall structure suggests an attempt to lure users to potentially harmful content or further stages of an attack. No scripts were extracted, limiting the ability to determine specific execution methods beyond the initial document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160893095c4d1e---14862903888.pdf
    • http://angelojrobles.com/admin_initial_test/userfiles/file/bamugavozavuturiviwote.pdf
    • http://shs1977reunion.com/clients/41590/File/kinuwilivuwebokesona.pdf
    • https://icbacademy.com/upload/files/42336405786.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d9b315070dd---45782563017.pdf
    • http://klpa.net/userData/board/file/62132287757.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b28ebbd3738---tejesuvaxumewugufewek.pdf
    • https://advantagelic.com/singhania/downloads/file/74055530129.pdf
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/2ehoqir3q1qarfs6so22rp0tn1/72573194752.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/91a9d91d13c31888ef458f30541dd082/xowuletixunumatevul.pdf
    • http://stauarchitetti.eu/userfiles/files/kajele.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082fae0b3b12---jofilugekovozibobapanuf.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855d594de05---gesez.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d36339aaea7---womulanor.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e8d1304ef---juwajofepasavafozetoju.pdf
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/42b920af59aab5de80c6b0ef7ffebb5b/penojezebebafu.pdf
    • http://xn--aknmedikal-yub.com/uploads/file/62283514747.pdf
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16081c61b27e6c---nazorukarobijubefatokalas.pdf
    • http://seanmore.com/userData/board/file/tetuzefum.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a323194896---6048389241.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/a092e07b0bbb3260552247f69a6941c4/87749863566.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d52ddcd824c---2297557735.pdf
    • http://goref.ru/files/file/15474485841.pdf
    • http://beergolfers.com./blog/images/file/11884788210.pdf
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/81dc3ed8b7b3191cbf8e92006c934fc9/fojuxufuxufodar.pdf
    • https://topjobsnepal.com/ckfinder/userfiles/files/kinorewejorivaputabon.pdf
    • https://ikima.fr/uploads/file/fuvenepubikatenur.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+answer+interview+question+tell+me+about+yourself+examples
    • 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_off00010d58.bin
aa821a3da4a716954fca90f4dcc473d1404a030ac9ab9a5c2a2e3943b4418e6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D58 17636 bytes
font_01_sfnt_off00013bcd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13BCD 16792 bytes
font_02_sfnt_off000153e4.bin
e83d3c65df9ce8bdf27d766f4896d23e269e86a6a52d3bf6ea1dc64ee2e4f49e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x153E4 11264 bytes

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