Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c3798c1a1dba0fe…

MALICIOUS

PDF

87.1 KB Created: 2021-06-28 03:54:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3dc7e115e2cde6b741f62db42f78876b SHA-1: d354cc238e552d26e5419c8895705710bab49e8e SHA-256: 0c3798c1a1dba0fe4f454c8fcefa9b25448380bb767e345779dc8eaf80e80b8c
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites or disposable domains, suggesting a link farm designed to lure users to malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://ahcxdq.com/uploads/file/080005431995.pdf In PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f43d5b0a30---lufutubu.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/978dfc3a1327b164fffbab746e6fd1f3/57739337875.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081af6e34f97---3744332469.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/17272132d8627009b492ef4896951d1a/bipaxa.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b24377b9ce---pijakoluj.pdfIn PDF document text
    • http://avgdesign.com/userfiles/file/narugojiperofatevugen.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f802b2ba19---wugirewesotazoziforufegup.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767fa3f306b---71724396816.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/39114040033.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/8c786ad2fe04350ca04f871b5b3d32c2/wezemetikaleripex.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/xesikuxewiwe.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/maan936c4qpie4rlk2hh9s0v05/37691615496.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/vuxunaluferute.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/gigorijebap.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/erm9dasb483gjbkaa7vvobc98j/suledegozesuvatimadebinis.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/80ucfobigitovf0trao7hfembj/tikazafumalabofopusuponuz.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9e062fd7b---jejeroxosixakixofitux.pdfIn PDF document text
    • http://pitneyclan.com/clients/c/c7/c7afcfad87c307b096642b2e35f52d25/File/43479632622.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16098b102c75cb---pedabefubis.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/7b18684dd5b26b24c3d9088a7c35baab.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/rj1s8ed04elq6tk6vgfeehavid/mapifazuvi.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/jopawusolid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=the+fx+bootcamp+guide+to+strategic+and+tactical+forex+trading+pdfPDF 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_off0000f026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF026 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001083d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083D 11372 bytes
SHA-256: bcd4600847e58dd1ecf4c6d0b4d53d2473af7c7b014ecf530ebecc0d5761a185
font_02_sfnt_off0001226e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1226E 16964 bytes
SHA-256: 8901632d15272e27ae35763d7869342c8555012f64784e8f447002e326df3f1b

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