Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ab8a53d0b9721b0…

MALICIOUS

PDF

106.9 KB Created: 2021-07-06 21:58:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2995948c10b2034cb22484639b543328 SHA-1: 7f07af67815230549d230d26813df9a4d8e0332b SHA-256: 2ab8a53d0b9721b0dd21b94977a35213bd314bb6036f4ff6558f57acf18140f8
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites. The presence of 'utm_term' in one URL suggests a potential phishing lure, possibly related to job opportunities as indicated by the term 'librarian jobs for freshers'. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e69b32a7e5---85968960068.pdf In PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b702f8ee83f---2318019874.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd447c504e---52769158188.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/opgamjvrad9uvlcvfabhtb6tba/bejosedimivesetufelivirok.pdfIn PDF document text
    • http://snypes.nl/img/customer//files/golesaxizewax.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16089f83701f7f---jemijeka.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/59890845406.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9af882b709ed072ba6b1d867104eff4d/jadegageferowiwa.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/rowipodifekujewefevow.pdfIn PDF document text
    • https://mintowncoffee.net/uploads/images/files/futilekovejojadas.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16092b33f85e6e---98320553748.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/c1232f15606622f7d079a64a5e5495d7/31646813124.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/70013539486.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/75082062701.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/febapojagupebejalax.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aab96f193ab---18726715754.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/2050810315.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/fghbferqjj9loh14neak6mldgi/63007734857.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/8800cbc9b9b22d3bdbfd5a9159b78586/xolalojobun.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/58878aba409529ba2abb211b24663056/kuvidal.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4403a6f34---66893875300.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/xugibububinugu.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/06f52e6109d65d479ebd1d98f7f92b2c/lebufefezutulan.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ba01ef38acc---80734796750.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=librarian+jobs+for+freshersPDF 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_off000141ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141AC 10396 bytes
SHA-256: e47ab3a5c0b543340f8fa1f9b527566ca4e3743c6cc3ccb8a9c7815acab477bc
font_01_sfnt_off00015907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15907 17272 bytes
SHA-256: a6fff36e22b09a645f4e2579230cbbc0072e4b6f33bf51a265309f2c4b3b9174
font_02_sfnt_off00018635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18635 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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