Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a54d7ee53f4aa92…

MALICIOUS

PDF

74.2 KB Created: 2021-09-28 05:54:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 15dcfb9b518e92ff2945f1649e7cf6da SHA-1: a2a198c7f70f642217b3b7e9db037c06c70a469e SHA-256: 8a54d7ee53f4aa927ae0988371de50a915c3b964ac3d4558c8756b3ae263ba4e
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple domains, many of which are associated with compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient to infer a malicious link-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/dunavegiwabil.pdf
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/r16ac5gdobqldkpefagihprdcg/ronelakavexodigazugo.pdf
    • http://gdgom.com/upload/file/210908200639994225orx1dg3h0th8.pdf
    • http://reklama-kemerovo.ru/files/files/dasopevixuleja.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161425f98a0cca---rakojisofubadok.pdf
    • http://phuocthuan.vn/images/pic/file/62851255105.pdf
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16146c885879b6---buguzinuses.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1614ac932b7b76---riselurudumubenegibojugub.pdf
    • https://onlinendttraining.net/files/81140624624.pdf
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/vegurixiwetat.pdf
    • https://vaitinhdien.com/app/webroot/upload/files/xawolofitunafifutapaki.pdf
    • http://blueview.nl/app/webroot/files/userfiles/files/warajibotizukozav.pdf
    • http://csc025.com/userfiles/file/20210924011939_7svode.pdf
    • https://ldcpc.com/ckfinder/userfiles/files/dixeridivasize.pdf
    • http://armanetti.com/images/tomamijuvivulobo.pdf
    • https://purevdavaa.mn/uploads/ckfinder/files/zesadugiwaziriditosa.pdf
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/giporakowedubogeta.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b88ab25d10---47668532506.pdf
    • http://dayou.tw/uploadpic/files/202109120008102424.pdf
    • http://www.huntsvillepr.com/files/files/bukav.pdf
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/simitisiwomorakisamibedur.pdf
    • https://permargi.com/files/galeria/files/96727123848.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142e8d8a8d4d---gebitutipag.pdf
    • http://rajhansnursery.com/userfiles/file/44438056974.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=android+studio+web+service+example
    • 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_off0000b81b.bin
7a17c8f1117009c88caf2bbc5e3f20866a81cf249ab075e8f95167c0fb5e89ae
pdf-font-stream PDF embedded font (sfnt) at offset 0xB81B 11148 bytes
font_01_sfnt_off0000d20f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD20F 16792 bytes
font_02_sfnt_off0000ea21.bin
0bc8a255021aa8a8cb906282bf799b27aa239cfc5d70e1aa4ce63dbb389852ca
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA21 18992 bytes