Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cfc3f9bb2453ad2…

MALICIOUS

PDF

90.2 KB Created: 2021-06-26 14:22:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d88e871443d73a64d8133ca43665fc80 SHA-1: efab6168274313051408846f26ffa71d69b4bc1c SHA-256: 2cfc3f9bb2453ad27709f17d240838edc6e516b9d92f9c5be3cf4e2721662fdf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution lure. The embedded URLs, while numerous, do not contain specific indicators of a particular malware family.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d09d00e437---josuxefonodizeveweju.pdf In PDF document text
    • http://hoangnamjsc.com/upload/files/kefoxinupope.pdfIn PDF document text
    • http://studioego.cz/userfiles/file/81426243094.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5ea7d46fa4---36566587306.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/d7c4d1673228413bfd2bf82d792058bd/wulemarenine.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/5jjvajjr20jtg2gucamiccarg7/zemulujowebo.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/0e968fed205b67c74cc2951218cc841d/kuxomemijasat.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8db87f79daee0c906e9dd3d22bba0eda/mabigelazelagenomosoz.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f133c8be55---39762072106.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/3f368e2b4907da457c9ff9acc8a7c659/78817230683.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/1855babbc7573761f33bc61b81ce5c2e/96399392345.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/fobiruz.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/3345559367.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/damosegim.pdfIn PDF document text
    • http://aquatrustfina.com/userfiles/file/wuvefopodugadufevopap.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d25aa512e94---nibevofojutep.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/29b10d4455ade1e09c9b6a18c2a5282d/39875323752.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b72509fe0---78590911788.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/kjkvabl2uf1rqmc90r7d2h74a1/57165357822.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/nevovukekepevesanivupu.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbaec4ae94c---solivosufamo.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/61f3c8f052fc4d87ad91625a1712e61e/6630017415.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16095a0070b2b7---91930989737.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/dataz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=work+play+quotesPDF 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_off00010007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10007 10492 bytes
SHA-256: 464e7910ce316f0b292761a98057d16dcf4faf7372f13c6c7f96d1a3480f59fe
font_01_sfnt_off00011820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11820 16988 bytes
SHA-256: e2ddb240840370e1ab1c0638f80ff41ec37f6c57fce5536675cd02b3e529233a
font_02_sfnt_off0001440b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1440B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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