Malicious PDF — malware analysis report

Static analysis result for SHA-256 37e78b6838500d53…

MALICIOUS

PDF

86.1 KB Created: 2021-09-01 08:11:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 70d17a356ae15d651c6e24655c819330 SHA-1: f4bbfc8154dfa64116884bbb16d4c03e557083f4 SHA-256: 37e78b6838500d5358a648e108cc2435ac3eac73d2a9e5dd40c514a22ab26d51
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 https://searchlink.org/userfiles//file/nomonagemejozijafelujexir.pdf In PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0caaf06c2---xigeramusobafetefor.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/23017842100.pdfIn PDF document text
    • http://annandale1963.com/clients/69704/File/82964265623.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16106712541be5---xivewididiridepoxinafaf.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0ad47ada7---gorupuw.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/53406340165.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/9fa496d08daaf3a1562f2c135de18509/zivetubetejejosid.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8042b3fa2---82171565423.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0348039a2a---35509972910.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160e7bf4fc46b8---nogexasirowibitibanozu.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/napolemilamagafe.pdfIn PDF document text
    • https://www.willmarareachamber.com/ckfinder/userfiles/files/pivibuvivon.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1e61b5d3e---88442557161.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/4qch42f3jt59na6cc91fnbe803/xaneremu.pdfIn PDF document text
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/7148987867.pdfIn PDF document text
    • http://jkmdc.com/aversystem.com/userfiles/file/38144059114.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072037f37769---38448260318.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/mozanefef.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/tirevefavavu.pdfIn PDF document text
    • http://iproperty.ae/userfiles/file/xefebikilemipijo.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc5a6ab590---58993638114.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/melipefagasovazoxajal.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc95ab14c4---nezinuxilujaf.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/40316088916.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=tom+gates+excellent+excuses+pdf+free+downloadPDF link annotation
    • https://rt9.rspo.org/ckfinder/userfiles/files/sizemopowipab.pdfIn PDF document text
    • 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_off0000e4db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DB 11124 bytes
SHA-256: 9d34f264bd8772c1c6b4d63d0d08d7b1909674f3e9d97cb4fe7949d40f060623
font_01_sfnt_off0000febd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBD 18476 bytes
SHA-256: 0faeaa05e74ca311b11f5bf84fe4760eb9fce50d1e942d73f412f4e5e32cbe66
font_02_sfnt_off00012ee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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