Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaa5c6e1fe0e42f7…

MALICIOUS

PDF

84.1 KB Created: 2021-08-08 20:51:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1c49d0e2f0b0df928148a87adf547271 SHA-1: f2ea5d3abed8fa02acbcd9e1b739ca65af1c0789 SHA-256: aaa5c6e1fe0e42f7ead2a2648d674ede4c029b3d803272dc95493572bfeceecb
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be1cb3c53b3---64404462225.pdf In PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c30a157763f---44645312236.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/wuzodewinukopijopuradow.pdfIn PDF document text
    • http://888chji.com/userfiles/files/nolofepevuwewaded.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/512e5917dad1a4656eb968593f68fe02/vanafelipoparofaliva.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/282fce26ddb18f5755a28ec4295d6148/89504500721.pdfIn PDF document text
    • https://adreshosting.com/calisma2/files/uploads/27132036480.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e61ee4061---19664922172.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609c250970ec2---60457836667.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/d37968a8f2c34e9f11d3a110572f3531/lepatejizotususajafadug.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f39311b3e74---44461534289.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607818bbc5b07---gumuwavotepupel.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/8dpm1cqiqqe4kiu4bf8ogaue4g/66677145289.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/44037962667.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/af46ff50253f143f1df3ba28ba699441/zewudilej.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/17989993388.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/taxoxunirawowimovagenud.pdfIn PDF document text
    • http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fowusumux.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/76690006993.pdfIn PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/palixekoxawaleranas.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/0463bfb13e2d2df4d0a58bfcf09c847c/ragenememugiz.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609f79882a218---38681793162.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=kuran%C4%B1+kerim+t%C3%BCrk%C3%A7e+meali+pdf+diyanetPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bbe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBE8 22620 bytes
SHA-256: b63ccb02fb28c3915fecb34be06ffa778fae788132350ede178726097e19dc11
font_01_sfnt_off0000e493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE493 11104 bytes
SHA-256: 95adf286c117987d8fb2bde7ada2258ec7990af917db61a710cfe07e60349c0f
font_02_sfnt_off0000fe05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE05 17400 bytes
SHA-256: a59e0fd379e58609e34a008335a060b88a017d7a64a7ab1c576c3b4dc207e804
font_03_sfnt_off00012833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12833 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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