Malicious PDF — malware analysis report

Static analysis result for SHA-256 a98f4156017754aa…

MALICIOUS

PDF

103.1 KB Created: 2021-08-08 04:33:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 4fcc3aff4e7fcdd339a21d549ccac764 SHA-1: b78fcc4d56dc8602a4c41dbe225141af99956c80 SHA-256: a98f4156017754aa16dee39379563bc6e5a6f624e82fbd8180feb34f577fc7b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

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://sweatrinserepeat.com/ckfinder/userfiles/files/12254587322.pdf In PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16079f99506bf8---degilavu.pdfIn PDF document text
    • https://bagstyle.uz/images/file/goruwit.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/jetij.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/15e562e826cfaf18188b3b5cfe900706/58173128194.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7913253b0---29969420130.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/58663428373.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d58766fcf---movuponadiles.pdfIn PDF document text
    • http://styropapex.pl/userfiles/file/14221596155.pdfIn PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/lemupugidajizodalo.pdfIn PDF document text
    • http://muszempilla.com/files/file/modofadonolu.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/75cab5820d005a4831d1758739c7dfc9/notevapexudefawibubaxo.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/felowoboruwomeg.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16081a473588a4---wulimunelub.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/zijijogisej.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/95532563815.pdfIn PDF document text
    • http://silverleafspa.ca/clients/10619/File/50202625930.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4eb0d91c2---78026585466.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/76907826346.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/bimuretibesaleful.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b3273131ebfb0633f9aabd923e638743/57066416726.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/63340313774.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210726_122007.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/h1d0e5d5edi0ig5jiml5ffgmoi/72353672725.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/gatotogotilim.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/u5nu3s5r8rbkubgd8lq4eu08k5/78096688424.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+to+fix+a+sharp+tv+that+wont+turn+onPDF 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_off00012c46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C46 18688 bytes
SHA-256: eaeed603b045c7e500cafe04e1af0b8e6edbd3a416a484115664b9cbff7ae56e
font_01_sfnt_off00015d8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000175a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175A1 10620 bytes
SHA-256: 77e69b43a165b40a5650b4f8c066df491c0e9372b3041ee44560a66e53deea31