Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5730869950ac0f6…

MALICIOUS

PDF

83.0 KB Created: 2021-08-18 22:32:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 6501efc67746d16f48d6662dfeadb52d SHA-1: f5fc1de4aa2d85fcd29a43d303930ac433603f80 SHA-256: f5730869950ac0f69cd1e7b53ae98c860c215b2e8e8d8e8113e2993f4b4c8f00
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of external URIs and link farms on potentially compromised CMS uploads points to a tactic of leveraging existing infrastructure for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://mexvp.com/ckfinder/userfiles/files/fuvoxuzumunev.pdf In PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/43833a17ced827566e61d415aa791192/11306887847.pdfIn PDF document text
    • https://songhong.info/userfiles/file/56487932550.pdfIn PDF document text
    • http://changju-hotel.com/CKEdit/upload/files/49222113567.pdfIn PDF document text
    • http://jingyitech.com/uploadfile/katorisasaxi.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/76950204225.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/m6h3t99omd937da2lcl3itr6tq/junizogeruto.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb8534fdcf---76553848723.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/muretabuwapeve.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ac79e1e1d61---37226636142.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cac9e66d1ef---58239817447.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/pokiperulojexisuripaxemu.pdfIn PDF document text
    • http://otczenacts.com/media/files/68555500967.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/lidowoju.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/637f6c3b43c47af095b54e0b19e49b60/449754524.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0806/99668b3c7a7752967b7a7dfc61c7a145.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/33c451299c2983f1b100f6c4cb3b34c7/44711572620.pdfIn PDF document text
    • https://airxps.com/userfiles/files/xivenatiganox.pdfIn PDF document text
    • http://haumeaonline.com/userfiles/file/9342608072.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/08/files/210816141913.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609452eaea11c---45396692225.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/tofoninebanatalaji.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/18495253891.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/7f0940d155fe4508d32294421cd1d42f/51235163338.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e96211d229---muveledemavezuwenubawum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=punctuation+in+compound%2Fcomplex+sentences+pdfPDF 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_off0000e1ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BD 16692 bytes
SHA-256: a5bad175ce93df34fc869bc0ebe058a30108820bc5aa2a63ca5ab07cd6d85694
font_02_sfnt_off0001248f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1248F 10916 bytes
SHA-256: f027224555ed4aa6662aa2a23de2c0ecd5f0f5d4a68e0edccf4ae68672162d64