Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b75b37657dfea08…

MALICIOUS

PDF

86.8 KB Created: 2021-07-17 19:16:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 227b724426db055f63d590b80d3876b1 SHA-1: 259d5b8e76c66d155b6ac528830fd33f4db1f741 SHA-256: 6b75b37657dfea08eb5359bcc508b4bd98b18c5060b98a1c9f9569390cd6081e
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised CMS platforms. The presence of these links suggests an attempt to redirect users to malicious sites or to manipulate search engine rankings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://ats-dz.com/userfiles/file/raxewimitomo.pdf
    • http://miraesusan.com/ckupload/files/dogiro.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eea57ccd51---37868966163.pdf
    • http://www.sphotobooth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a502a2ee1---13608896310.pdf
    • http://forter.vn/hinhanh/file/xenubegijujoj.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/92dd051c77f7b0382170aa93ca8f868c/25803666926.pdf
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/745c595e37772a44e06083e398fc78e8/82232181641.pdf
    • https://aspit.ro/imagini_ws/memamulinotemifodimoz.pdf
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/c51aa372adec6c1a5b86072274c87e35/zujozuwisasegapolaral.pdf
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210626_CA06506A2FB55B8D.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16075fb2d4b4b6---2014299604.pdf
    • https://alexandrapanayotou.com/web/images/static/file/65075243623.pdf
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/b7fe637b6af0fd8b56ec483c386a8353/87417169105.pdf
    • http://kingcraftviet.com/uploads/ckfinder/files/vamojatin.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/p836n974h3k2i6kmrnt252j0q7/nofoti.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160712e10841f7---rizudamawinezitugefodukik.pdf
    • http://horlickhigh61.com/clients/a/ab/ab3fb267cc30d45b98f460a20cee0b8d/File/27583786951.pdf
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a6757cc86ee---16348628448.pdf
    • http://tamker.hu/userfiles/file/63284943192.pdf
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/wulabifafigivewubaxidajin.pdf
    • http://biotop-zamosc.pl/userfiles/file/powefuwasaveparafodidepip.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=brown+discharge+before+first+period
    • 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_off0000ef7b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7B 16792 bytes
font_01_sfnt_off0001078d.bin
96332123d9f32e6ae1e94db1ea4ccbe1493f1143d1e34da13a2c50302151a6e8
pdf-font-stream PDF embedded font (sfnt) at offset 0x1078D 17112 bytes
font_02_sfnt_off00013465.bin
36f6f85132e5a569237eba48b12e5a7f55285eb04953beb77eb9e0dbd0097e46
pdf-font-stream PDF embedded font (sfnt) at offset 0x13465 11132 bytes