Malicious PDF — malware analysis report

Static analysis result for SHA-256 46d17651f423112c…

MALICIOUS

PDF

76.9 KB Created: 2021-09-03 01:32:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b26c131647dad011b3173f049b227841 SHA-1: 401efbbb824f5596c99d4947d577e6da3b663137 SHA-256: 46d17651f423112cb3a3e4f7ca2820f653d07ae195680b820d1b3e22add941af
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a phishing or malware delivery attempt. The presence of embedded JavaScript and numerous external links, many hosted on compromised or disposable domains, suggests an attempt to lure users into downloading further malicious content or visiting phishing sites. The ClamAV detection name 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://konemara.hu/userfiles/file/18182273105.pdf In PDF document text
    • https://pu-sk.com/app/templates/js/ckfinder/userfiles/files/dolazanelivezilezawiru.pdfIn PDF document text
    • http://foodchemsino.com/d/files/susitusosopumawaje.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/9403527867.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/ganujunopetixovum.pdfIn PDF document text
    • http://hanarotalk.com/userfiles/file///83836865096.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/21481731220.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607487e7ae71a---xivukafudazixifo.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608528feded42---fokuzapiteju.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608544e2a36d4---rewivexiwa.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086edd8985b9---pimimuwumilota.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/206becae2fbf06f8b9708e3fca107d0d/kitimijetufupe.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/4eeadf3c087f8350821ef4c032cc2cf4/tunuzajiliri.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/35036700594.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/10116546888.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/95900584322.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/0iglbns8b2bkp24e48sde8iuam/levuvod.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/93423144254.pdfIn PDF document text
    • http://krupongs.com//images/file/nokigeri.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/i7bg57riaekhc273n65fhfsun1/tisorilofopeduwapovo.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/besojakegitiwozu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=pdf+merge+file+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_off0000cc3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e44d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44D 16408 bytes
SHA-256: 8d9ce20de79728f9ecdcfbcb929831e0863b9b7d149439c0f1d98e7e56d10e4a
font_02_sfnt_off00010e73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E73 10516 bytes
SHA-256: 8ef22e64dda251c8dfca8d57454001b7c8ab068c17369b18de3c431def31d0fd

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