Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f1d5977e99e9b9a…

MALICIOUS

PDF

85.1 KB Created: 2021-09-18 14:54:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3e75bc729108150e79e1a31379d0439b SHA-1: 1869db10548e21885caca67777bff60156cb4962 SHA-256: 6f1d5977e99e9b9a23e64a921218a12a1a18727b1a2b68b7419d0da2c16306ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm with numerous URLs, several of which point to compromised CMS upload directories, indicating a potential distribution point for malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://oniceh.ru/uplcv?utm_term=dead+by+daylight+mobile+mod+apk PDF link annotation
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/29849154603.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/tanokizolifowutokugup.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/161327d44952c2---dosidesesekesogagebomusu.pdfIn PDF document text
    • http://ets-sptk.ru/pic/file/rupanapobuwubumopufesaxam.pdfIn PDF document text
    • https://unitedfightalliance.jordanadams.com/ckfinder/userfiles/files/90372553642.pdfIn PDF document text
    • http://theprofitnesstrainers.com/userfiles/file/42256355184.pdfIn PDF document text
    • https://marsanz.pl/uploads/fck/file/jepev.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/60151115932.pdfIn PDF document text
    • http://valentine.tutaylamhet.com/storage/ckfinder/files/luwakikujalaturoboronog.pdfIn PDF document text
    • http://donghobaoan.com/uploads/files/pavedigumekigo.pdfIn PDF document text
    • http://kp-technik.cz/ckfinder/userfiles/files/voxek.pdfIn PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/rerakiwe.pdfIn PDF document text
    • https://remont-bez-zabot.ru/files/file/53430102050.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/jebemuvatezekobodin.pdfIn PDF document text
    • https://liftsystems.ro/LiftFiles/file/vezuromefefirogoxon.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/kenimavezusuwunugizet.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16143607646d54---62338384492.pdfIn PDF document text
    • http://jingkangchem.com/upload/files/vamujobol.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307ef2be0b7---49551213654.pdfIn PDF document text
    • http://cnwt.mgo.cool/upfile/files/2021/09/03/lizulu.pdfIn PDF document text
    • 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_off0000e43b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC52 10812 bytes
SHA-256: ac5e61ec0f1ad1e3e0b556f2a06f424db966aecd2c6c3f7a275a4ab875521554
font_02_sfnt_off000114cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114CC 19508 bytes
SHA-256: e29009018ad63170de120036d29302a1739bd730ebf929d8747905be1c717c5a