Malicious PDF — malware analysis report

Static analysis result for SHA-256 de39a454618b7c95…

MALICIOUS

PDF

88.5 KB Created: 2021-07-23 17:28:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 57cc169275f3102e15a0f38dc5e9e65e SHA-1: 62359384b281e0b02d956409aa4358fcadb273af SHA-256: de39a454618b7c95fe088e44e5782ec2d8aa2a6a051b65de42eb02ef322b42ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malware or phish for credentials. The presence of external URIs and link farms on potentially compromised CMS uploads strongly suggests a malicious intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/6332a4d27a84b79c7e9d89ac1f04b0c2/tejidetow.pdf In PDF document text
    • http://catgarner.com/clients/873270/File/82028858429.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b47379b582---16599799085.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee0531059f6---lijakizo.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160abe7408279d---logexuvawikosalikonifowe.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/jonijonodeteva.pdfIn PDF document text
    • https://datajournonepal.org/files/basiwavidasuzivi.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/827f8bdk1ge0qoak77ld61mpb3/dubepotetomugedu.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/givj6cagf1c9iae54ut6d2n0i4/29854313048.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/77220509754.pdfIn PDF document text
    • http://www.ortodonciaelisafarache.com/ckfinder/userfiles/files/95037133085.pdfIn PDF document text
    • http://minutemen-jrotc.com/clients/84940/File/rulemixogogi.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/rfoad08ph6cqnsk2os2p5dkqle/gixefaguzojiwebowikosali.pdfIn PDF document text
    • http://placc.info/up_image/dikepakapobujewinem.pdfIn PDF document text
    • http://etre-belle.su/images/file/25812557687.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/31787542645.pdfIn PDF document text
    • https://subarini.ro/mm/file/perufokalab.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/53134df487d5c50ae0c74dfa0486637f/90276330446.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608176ed0e09f---gimapavubafawimukog.pdfIn PDF document text
    • https://indolabtek.com/Uploads/userfiles/files/pasulexu.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/10ebf8d1384da4065e6fc100d8c96488/netazirapulis.pdfIn PDF document text
    • http://bwc.lt/i/89758002768.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756f3970a31---zopuz.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16208712168362.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=sound+equalizer+windows+10+free+downloadPDF 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_off0000f4d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D5 16560 bytes
SHA-256: 3ff4e40cc38080a549f8a14cbb7038f57175a318ff0573cd935f56d9b0239271
font_01_sfnt_off00011fd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD2 10888 bytes
SHA-256: 0b3c76895e55f1c94390de4d6e2ae1a3ddae0556acb2de837c57db07e94fe5b9
font_02_sfnt_off0001390c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1390C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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