Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a31f51899f03ea9…

MALICIOUS

PDF

85.6 KB Created: 2021-09-01 13:30:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 64fbe69c3f5bf805e7603945b085f93d SHA-1: 4f9f2faedab55cb5afcc1d8610c56599ef8ac7fc SHA-256: 1a31f51899f03ea9cd6bead87d1c2b20f80a38d6e7c0516fe7aa5bf896c0d708
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The heuristic firings related to link farms and compromised CMS uploads further support the conclusion that this PDF is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://krisoc.ru/uplcv?utm_term=lost+naturalization+certificate+replacement PDF link annotation
    • http://anhbanglaw.com/userfiles/file/tuguluzuzusike.pdfIn PDF document text
    • https://brtim.com/uploads/wysiwyg/files/tepesatanena.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/8997071096.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834200846fd---musoledo.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/liwonukijefekasolanipimej.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5d2d6fd5b---42444161162.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/6246723764.pdfIn PDF document text
    • https://rajatotogroup2.com/contents//files/kapoz.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/536ca8d2eae4f98e23b577f2102e900f/bululatumiban.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/f58c99d5a5f376afbecb7c0c4ae8ab4e/wenapemevar.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/091dfe34c7117fe010235f9ce6318efb/raxavakafavefis.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/wemoboxikelaliweduvirib.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210622222530.pdfIn PDF document text
    • http://fluellentrees.com/clients/58222/File/56517981082.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a512023a1e5---liwekatowake.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e63f1041d74---lepileseke.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/wejipeluvafi.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd5655d089---xowiranaw.pdfIn PDF document text
    • https://khachsan295doson.vn/namthuan/images/news/files/jovag.pdfIn PDF document text
    • https://adci.vn/data/upload/file/7132900671.pdfIn PDF document text
    • http://azstorestudio.com/uploads/files/25042074900.pdfIn PDF document text
    • https://tepihtrava.rs//files/25812428839.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/nuwufajerer.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1f8cb3cbf---76666279950.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/6839f743b24136da85d128bce0c71faf/toxulapogilodelotoditelo.pdfIn PDF document text
    • 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_off0000e773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE773 10760 bytes
SHA-256: 289f37b41d11385c73f17b9c887886ee826de07bbb2a5eddca015a46e6768bf3
font_01_sfnt_off00010036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10036 18916 bytes
SHA-256: 969f15b23878994816b722d720f41ee6ca6b478156f03f025b1e29ac0c91ae35
font_02_sfnt_off000130a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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