Malicious PDF — malware analysis report

Static analysis result for SHA-256 1db4671f5856167c…

MALICIOUS

PDF

84.8 KB Created: 2021-07-13 17:15:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: aa2d4c3cfbd6da58562514caab965925 SHA-1: 1a24f076fe844256b7d6f7ac155352f6df1e0f78 SHA-256: 1db4671f5856167c2cad258bc9b2a3ac5442ebd4cac683fcd0e19feeda18fdae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by a ClamAV detection and an ML classifier. It contains numerous links, many pointing to compromised CMS upload storage, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious websites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/943443d24e981c7341ba8e99b6d3e949/1693855149.pdf In PDF document text
    • https://a2designbg.com/userfiles/file/tigawamo.pdfIn PDF document text
    • https://securitydm.com/slicice/file/muvamab.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021052504095545.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607add0e8bdd6---xipexoxofesoramemobuvel.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/kijolebumeli.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/sodatelofo.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607a54248564d---kabopexodewivitefumar.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608480074fb52---26363226171.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/80373070887.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/80897198610.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1608e012e98c47---zejonalose.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/5b29e328597e5d903a6794bec10905ed/22474204642.pdfIn PDF document text
    • https://gyandeepjkss.org/userfiles/file/84094620636.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/0cdd74d90a7521886b2fe0cb60d80161/fiwadafilavijepugefowewa.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/19508154913.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/6df4cece5070d91659766a7c5add002e/logexuwiriwubirafudupoden.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/60962140610.pdfIn PDF document text
    • http://simonide.org/userfiles/file/xumuzewajawikivobofu.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/d878af2968c690733d864e4e096c9e37/mifutujulifirajin.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/f9bdeb62b4abf2e6289f4d709f8fb4db/jeveti.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/0e38eaee97a42f6b0da2a875f029e413/46710093066.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3a2270655---seleropifudebovasi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=c+language+short+questions+and+answersPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e67b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67B 17684 bytes
SHA-256: 2b2008a6f58d8d35156e87ef648b4b61f6d01dc05c512a97377c810dc3303c55
font_01_sfnt_off00011545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11545 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D5C 10892 bytes
SHA-256: df564f007b17ffe4f16db6ab8c9a76d63ccd8500c9412cfc699e172a878c9a9b

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