Malicious PDF — malware analysis report

Static analysis result for SHA-256 57941ff4984f50f5…

MALICIOUS

PDF

98.1 KB Created: 2021-07-15 10:51:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7483d77e14759165924ce05efc41cfe9 SHA-1: 9537034bf700baf3a7c7f9833ff7002c771686ee SHA-256: 57941ff4984f50f5a17d819ef0346bac2acf49f4c5eac66a44a0a103e2b32fe7
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, likely to redirect users to malicious content. The document body is heavily obfuscated and appears to be non-readable content generated by wkhtmltopdf, further suggesting it's not intended for direct user interaction but rather as a vehicle for the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://careerdynamic.com/clients/3/3d/3d9dba0a3645e5854abf1db7654b9c86/File/7018343350.pdf
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/7cebdacbd603e9234464fd3040c8b729/56044104096.pdf
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/13357243468.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/92689ea71d5b1af891c659f97589076e/nuket.pdf
    • http://wecans.net/_UploadFile/Images/file/wugenabawer.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d700fe38b3---vejupupegitarusozisotinob.pdf
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/96701579706.pdf
    • http://mobilesamara.com/img/files/file/zazevowiduxoga.pdf
    • http://szyuangang.com/UserFiles/file///tutalibuxipelaki.pdf
    • https://beautydiction.com/ckfinder/userfiles/files/zewadinuzipatipeni.pdf
    • http://miltonhigh65.com/clients/874455/File/xuvilexup.pdf
    • http://elmbbq.com/uploads/files/27078190693.pdf
    • http://bora.su/ckfinder/userfiles/files/42781672968.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/60ceba9c279f3874021168817ab7cc2d/jenifumibuboromifotalul.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca32b3b7f5---xuxexagefa.pdf
    • http://petraifevronii.ru/ckfinder/userfiles/files/tibumise.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecff418e48---burugafamuvobaba.pdf
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/469706d877f6b7684dda794db4bdfdda/zimuwabedevirenosi.pdf
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/ff7880dc5e18c3c80fbe398185049df4/43377171694.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a598d886060---38047192652.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160912c80e0c03---femoxesemedotulezupolina.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160713dfb37583---xonegimovazipufok.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e977d07491a---12505069946.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/hqb9mrau1gh9e214tkbagpf02h/furerilepusir.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/5bg6g3n20h1rs7cf6lmg8mkevi/ninoberugopus.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=psoas+muscle+digestive+problems
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011cbc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBC 16792 bytes
font_01_sfnt_off000134ce.bin
1932b3e1f1c5cb82df5e8d868e448943cb763d61a0d082e5185f60e0b3a363c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x134CE 17040 bytes
font_02_sfnt_off0001617b.bin
1892644bf3eb57e9787dcdfd6747738aa9f42607ff50cdfe05756e5d0587c9c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1617B 11060 bytes

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