Malicious PDF — malware analysis report

Static analysis result for SHA-256 b28c182edf019c72…

MALICIOUS

PDF

70.7 KB Created: 2021-09-01 23:01:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: db18b5327c50f61b377cf94027e93eb3 SHA-1: f6f4f087822ccf75a9e4eb2c419eb24bc1c58d6b SHA-256: b28c182edf019c721fb8d876e24d07051495cb700207ffd202aacba275ab013e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or link farms, indicating a phishing or redirection attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to exploiting vulnerabilities or delivering further malicious content. The presence of multiple external URIs and link farms points towards an attempt to direct the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://szao-spb.ru/images/news/file/faperuwej.pdf In PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/bepofaxixonuzasasowupab.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/98942337247.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210708_7DBA96E1941ACFB4.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/memilejisi.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/s6qm1o6q70s8lsiebaok5bv7sa/42635676938.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b5de039e1e6---xatopoz.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/2511319089.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160c1641b6ce56---56780792727.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0772c1294---jexazotakevabujav.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a27c374f7cc---dorasa.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/442a88cee1ac0015fe3d2f84219add65/zukafis.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da791760c2---vapobipejabuvufatutaxoz.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071cc7859e2b---texopopifuvepixa.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/la8blb9nioa9k7e3501k47r3g9/kavafipuzejovameruwikid.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/2209733154.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/vorosidut.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/62405541950.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210518100003_1344350165.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/f0e4d18363c2245e15c72cfc937e0f2f/naxizodejodaga.pdfIn PDF document text
    • http://ruresept.ru/files/file/jazagofu.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/41764116945.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/xonamomabazome.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=castle+learning+answers+key+earth+sciencePDF 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_off0000b63b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB63B 14948 bytes
SHA-256: 523f3f98a5ffed59d9655dab857a979bcf6cb6db8a195ebd3862b38a40ad99e9
font_01_sfnt_off0000dbe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE6 10712 bytes
SHA-256: 4a8dd5e69c75c7bdafa93e872c5c1b546aeb4284e9b714f98a07d5ed7bc17225
font_02_sfnt_off0000f487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF487 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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