Malicious PDF — malware analysis report

Static analysis result for SHA-256 15b0be564d22e34d…

MALICIOUS

PDF

88.3 KB Created: 2021-09-17 18:15:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c597d0c6da0b518c561ff941ce3bdf7d SHA-1: 716d1ff2858751eda47e5d46d106a325f76a1c28 SHA-256: 15b0be564d22e34d864ee1d183abf4dc59653471d8ae46077e836ac17a537792
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of links, many of which point to external websites, including those hosted on compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a link farm designed to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://apc-algercentre.dz/ckfinder/userfiles/files/wisaferuxamajo.pdf
    • http://igabana.com/upfolder/e/files/20210916182911.pdf
    • https://dulsuc.cl/userfiles/file/botirimoniwibir.pdf
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16138fa0bebe94---54012809102.pdf
    • http://sadiqandsons.com/userfiles/files/vidafixopademoxaxomopiw.pdf
    • https://haysalon.com/public_html/userfiles/file/12505537083.pdf
    • https://isleo.com/i_photos/file/xizepegokitaper.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/161379c13ebe41---jegetagutelukimalanox.pdf
    • http://anpo.vn/upload/files/gilamatajofikiridi.pdf
    • http://maidichike.com/upload/files/davirafipozex.pdf
    • http://qhchemicalsfeed.com/upload/files/27279144397.pdf
    • https://safe-international.com/userfiles/file/fogiweraxizipiti.pdf
    • https://trinityautorepairs.com/uploads/files/44205982668.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161413c959969c---salinotuvazafikekagezokot.pdf
    • https://kentacademymiango.com/userfiles/file/kuvejeguzanosoga.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d03c8e9f7---63033871846.pdf
    • https://kurashi-kyoiku.com/cms/dat/upimg/file/papinevozetok.pdf
    • https://valgott.com/images/userfiles/file/59623347207.pdf
    • https://okazdedziecko.pl/_files/Media/file/gumibimuratunufumefoda.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142e304c9237---11434852515.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161415bcf7a65a---94636206482.pdf
    • https://ladangmimpi.com/contents/files/potemexogubovex.pdf
    • http://laclonghotel.vn/upload/files/9865055991.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135863b9f5bb---kowarusemudepafudiwajiwa.pdf
    • http://aorganboys.handyfriendship.com/upload/files/36952913949.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+make+video+files+smaller+android
    • 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_off0000f298.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF298 16792 bytes
font_01_sfnt_off00010aaa.bin
619a75f786d06935867474473f80f9939c1010899d344fcba27598b5e4bc6039
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAA 18188 bytes
font_02_sfnt_off000139fd.bin
90c922315dac7b2bdc115a34332264387c0b4944f4841fa7955ea176c50919c9
pdf-font-stream PDF embedded font (sfnt) at offset 0x139FD 10752 bytes