Malicious PDF — malware analysis report

Static analysis result for SHA-256 51f479bdffcd6146…

MALICIOUS

PDF

92.8 KB Created: 2021-07-27 04:59:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 28d946ad042365f647c1f4cb20920197 SHA-1: 2135424b24fd7a8c8abbd30ba65c9ecbbb7a4a57 SHA-256: 51f479bdffcd61468c4aa42201babc016c17b58249e2373667cea9844546f232
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a phishing or trojan-like behavior. The document functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised WordPress installations. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9653

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://walkandsmile.com/userfiles/file/35351729969.pdf In PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a014f33e739---27423058664.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9b17d9d4a---73331811665.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a097f24a822---73505137415.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/76203662799.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/xewenipavojodejife.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/kesaloruz.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/38df8f97960e547f60273618bed1e1d2/vibedabibawoxonuxogafus.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/rapepan.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210629_4E380E2F14FD323D.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/08fe00cda415d55ab553eb2898038371/kimagogiwubelofumutaji.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160daa893f280f---rulekuleturujogobulewaxi.pdfIn PDF document text
    • http://tms-operation.com/upload/files/82838339287.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0845a30c0c---94978345965.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d50374e4cd---siburoxedakowaridu.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/18434671955.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/zubufa.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210601165529380586.pdfIn PDF document text
    • http://berbun.com/user_img/file/jifowarumi.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f21e6e6636---zuginewawuzezaku.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/lotivatojuvuv.pdfIn PDF document text
    • https://harom.ro/files/file/litivebanoxenesi.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/34365749145.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/7836055355.pdfIn PDF document text
    • https://kuepancong.com/contents//files/78200200156.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/106604349608cdeea0c371.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=proportion+practice+problems+with+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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ece8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FF 10868 bytes
SHA-256: de86691481a68c6504e18d207df82694da503070af3accca9de035474ed28c1d
font_02_sfnt_off00011db7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB7 17960 bytes
SHA-256: ccaf7693f5be1c1513a76a139b8af1164b55ae7528e91eac142b418f948d2559
font_03_sfnt_off00014cdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CDB 16392 bytes
SHA-256: fe141a6e39cdb2c5f83a2af8538982262c3324f196da57d1f343a38eb7368ad1

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