Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d8bc10eee1f9706…

MALICIOUS

PDF

99.3 KB Created: 2021-07-18 22:54:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a48ef3bea8ad2c790bdfc50780a0171a SHA-1: bb84d4f4a73dccd84debe9e30bc63653ea68b943 SHA-256: 0d8bc10eee1f97065597f76446a4dcf340eff56954b950f0930fb81f5a72a238
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs, many hosted on compromised CMS upload directories, suggesting an attempt to distribute malicious content or phish for credentials. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9839

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://scpt.it/userfiles/files/21218971483.pdf In PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a65dd4111f0---fonefur.pdfIn PDF document text
    • https://bibonatura.hu/ckfinder/userfiles/files/58500229309.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/40baa40d9abbc1f6bca331d9e4f9af7a/58179419686.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/fu19np42glt65j5n3o82d305h5/faker.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/v565a3albuvnq26dr3ogr5mmfj/92964081206.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d913e262819---kerinovabojekigivepo.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/d3237f69451d77e345b5191b35e0facd/takuputu.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-6-13/20210613020126785964.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/garumidas.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/8nfnao3e5k6eplvialn0njfvaq/17542863859.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606c82dea5779---56090607057.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079a0ceb5593---getenosamusod.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160a070766fafb---3660271901.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/jixolev.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/de19fe6a09c2858382c44548a578ba9c/xagofusalivodarofem.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/fitowiparedo.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/21607666159.pdfIn PDF document text
    • https://dock-levellers.com/upload/files/74610210676.pdfIn PDF document text
    • https://mimpi1pusat.com/contents//files/69980860804.pdfIn PDF document text
    • http://blatt-gruen.ch/files/18645152760.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/50824065a2b75804764daea796dbe905/12109589043.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=ductile+tamil+meaningPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00016011.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x16011 18908 bytes
SHA-256: 9a787c41d6c0ccc927cd946d77720e387b210457f1c2d426c07261a4a3f73c3e
font_00_sfnt_off0000de9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B6 10284 bytes
SHA-256: d6f26d4d3f847f4bf48a419ce0691cbc837dc2a21c5edea18c2524037f1e81ac
font_02_sfnt_off00010dcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCF 4036 bytes
SHA-256: 32a6ef68e48cee84b8f18d7cf02ad87e08633b66937aa4dce2799de37b805631
font_03_sfnt_off00011cea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CEA 27560 bytes
SHA-256: ed743679d6eccf4c4637db33444e3e52a133ca4c823611ef323ee2c333afe5a0

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