Malicious PDF — malware analysis report

Static analysis result for SHA-256 39112e901dade6c6…

MALICIOUS

PDF

83.8 KB Created: 2021-09-01 05:49:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 71323adb074702db522bcec88fabb388 SHA-1: d897c02c6f2e3f56692d61b5ed6e202f123792d7 SHA-256: 39112e901dade6c67133ecc2f033b160e450954e102a8081b70af679a58a974b
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to potentially compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and the overall structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://conganbacgiang.vn/app/webroot/uploads/files/79066674716.pdf In PDF document text
    • https://scriptdd.com/_file/file/49145347634.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/67411902381.pdfIn PDF document text
    • http://getem.eu/files/file/35715260979.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/p3sqjfuukhhbt4f9dg4uh95a21/66753328985.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16091e2d356cbf---23787926362.pdfIn PDF document text
    • http://stillwaterponies83.com/clients/74660/File/lavonibonadovotibutegajit.pdfIn PDF document text
    • http://xutricolor.com/uploadfile/files/66116600333.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/tagatexibeberepubudegi.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7724a0673---najajij.pdfIn PDF document text
    • http://sweetbasketsbyjackie.com/clients/864293/File/10683719737.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/77007297734.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfdb84ca99---73585228373.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a7bbabe91a9---65319383304.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/18816593148.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210821181436.pdfIn PDF document text
    • https://fcimoveis.com/imgs/file/penofebilusofix.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/7srqggneqo458obrs5c2pb8o23/63240896674.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/99181778300.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/dlkvbnqq0l4hcck1dv52tup5g7/wuxiralox.pdfIn PDF document text
    • https://chris-arnold.com/userfiles/file/43054850612.pdfIn PDF document text
    • http://candientuvibra.com/images/file/dufikijaruzutigosed.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/65519491468.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=everything+that+breathes+praise+the+lordPDF 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_off0000e0ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF903 10972 bytes
SHA-256: b460492bec63c5ad0882821279fa4591d3318fcd3d04a85231c040ff585ef6a7
font_02_sfnt_off000111f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F6 17536 bytes
SHA-256: bbda91998e4a9328e186aa623dccc026c2ec3834728e50ad1a17402beb713c2c

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