Malicious PDF — malware analysis report

Static analysis result for SHA-256 62166b05ddf51ccd…

MALICIOUS

PDF

76.3 KB Created: 2021-09-09 20:11:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0afdeb608c4269cc88b59065d7220dad SHA-1: 18027c7b9b64caeded8c419ce1f8be53134d7d22 SHA-256: 62166b05ddf51ccd925da97d92123d23fe234a4f9aef211129e9a4bd6eec37f0
96 Risk Score

Malware Insights

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

The PDF contains a link farm heuristic, indicating it directs users to multiple external websites. Several of these URLs point to compromised CMS upload directories, suggesting a pattern of hosting malicious files. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://aurastaffing.es/upload/file/dajekonunikirigakasakefi.pdf In PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/161370e8b7c548---45415609574.pdfIn PDF document text
    • http://melodylavernebettencourt.com/media/file/takeka.pdfIn PDF document text
    • http://tangiahoang.vn/Images_upload/files/jezitifupodepelof.pdfIn PDF document text
    • http://preiss.at/upload_files/files/sawomolexitowad.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136fdbabd92e---resewifomixerajaf.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/97122208091.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/2670c92aa91195890563fd2202c0ab0d/mejezejisimaresovemariv.pdfIn PDF document text
    • http://bakersfield.thepokeluau.com/uploads/files/fusuk.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/wikagabepigedokeve.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/92682589621.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/zuwidiwezorapam.pdfIn PDF document text
    • http://xn--80aesyq.xn--p1acf/files/file/73208266136.pdfIn PDF document text
    • http://hodoan.net/userfiles/file/59577463136.pdfIn PDF document text
    • https://dptech.vn/uploads/files/32755722622.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/wazovosexumugamaxatebedon.pdfIn PDF document text
    • https://horgaszvelem.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/puzimoboxodofeje.pdfIn PDF document text
    • http://xn----7sbqwxdbhblh2h.xn--p1ai/data/file/4981948473.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612f07b84fe5d---98329039491.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613235713b546---fozik.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/likuxivenizav.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/vizijudopalugegavizod.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210904032318.pdfIn PDF document text
    • http://elitk.ru/_files/53461649073.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/razogal.pdfIn PDF document text
    • http://southerncross-ex.com/images/blog/file/73973879331.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+update+android+version+in+redmi+4PDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c55e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC55E 10828 bytes
SHA-256: abbb6ca080d008d08631e7376a7f4fc6a187d4d425ef7f4dfafe927fb23497c1
font_01_sfnt_off0000de68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f67a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67A 17384 bytes
SHA-256: e208bb3d8472dc7595260ab22651ce5b8bd08c2598ead5df45afbae0acbdf14c

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