Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b2bc7a700cff9da…

MALICIOUS

PDF

75.9 KB Created: 2021-09-01 08:00:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: aed85dc99f02a8d5ce96f171b0d6a333 SHA-1: d26f0078216805483bc80b2a8182a805a192255f SHA-256: 7b2bc7a700cff9da9ed33346f7b15c8aaf63a4407d11dbc5698ee55546892a34
156 Risk Score

Malware Insights

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

The PDF file contains a large number of links pointing to various compromised websites, many of which are hosting other PDF files. This behavior is indicative of a link farm designed to distribute malicious content or facilitate phishing attacks. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160fa9b8aa9014---nimozo.pdf In PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3c39aa324---40802516527.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/gaxusawizomagavagutubuzab.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/46963330935.pdfIn PDF document text
    • http://classtool.info/upload/files/21618773725.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085933a90567---10072534999.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/delovilapebiva.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/l99sff64tbotbldh3knhgd6tb5/zuwazizimo.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/846fe08fe41fd1222a26955a25165105/18004788967.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/ju21s00ahfv2ckfiq7ei1qgmlm/pajotome.pdfIn PDF document text
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/d10bc3d1ae46b32245c30c7e1d34d38b/tizugagugopaxok.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/kisokosatotazozefe.pdfIn PDF document text
    • http://vinabomi.com/uploads/userfiles/file/79500709871.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/17915554324.pdfIn PDF document text
    • http://bige.vn/uploads/userfiles/file/48122404845.pdfIn PDF document text
    • http://cbwmd.com/uploads/Files/74226592548.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/pekidekunelezimamepopegib.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/qcr760besm3i8n4939pbonfev5/wolaziwosutaliva.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/zixujizowisobizaselamodiw.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/96b1886d37ce3ba2ef00f73d5c0e7a40/pamikoxa.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/58gh5fgh1upvsdkvikb68nepj4/28362304414.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/jiduwor.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160bccd58557f3---jixeterev.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/38148094084.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/mopide.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d77a92aa2---20475562287.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=best+hacked+clientPDF 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_off0000c691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC691 16732 bytes
SHA-256: 530d0895011ef3261ce206c085b87f1eb935a40de317522b631ee726570df78a
font_01_sfnt_off0000f1e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F9 10392 bytes
SHA-256: 2157e5e41820ba62a58577b9e9fde2f846877b39399f5443dfa18048ad1a160d