Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd4aa711508943a5…

MALICIOUS

PDF

65.1 KB Created: 2021-09-23 21:04:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f582bc4646cb81cafd7f6822e609af2c SHA-1: ba209981a41247e145cdc062b22156c3e5cda9c8 SHA-256: dd4aa711508943a54e7c21d8d7e14ff32ee685952cbabb9d563938ce145c9340
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier further support its malicious nature. The presence of external URIs and link farm heuristics strongly suggests an attempt to lure users to potentially harmful sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7309

Heuristics 5

  • 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
  • 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://queure.ru/uplcv?utm_term=minecraft+1.16+xbox+apk
    • http://bernendorf.ru/userfiles/file/xububaxomugar.pdf
    • http://sochi-polyana.com/ckfinder/userfiles/files/91934042383.pdf
    • http://around-sicily.net/userfiles/file/motumulinijivaruwibijope.pdf
    • http://aucontecnologia.com/userfiles/files/totenomojomixefo.pdf
    • https://indiantalentjunction.com/milan/media/35698244213.pdf
    • http://law885995.com/upload/fckimages/file/lujowuxenidalobivebut.pdf
    • http://webursitet.org/Files/file/vesuf.pdf
    • http://yetisirkaucuk.com/firma/files/lapuriwuvipafokafalanire.pdf
    • http://huzatfokozo.hu/editor_up/jemuwosumiwunemilu.pdf
    • https://searchkar.com/ci/userfiles/files/69783034834.pdf
    • http://www.cerel.eu/images/wyswig_images/file/dusosiwutakuxatibotisi.pdf
    • https://defi128.com/userfiles/files/44157918763.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614c39fd20897---rorukefodadidobipawom.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f10b4288e2---gejitugi.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/ptt7tfuqp60h19s1oguprt5t57/98286119885.pdf
    • http://djpress.pl/Image/files/16966496966.pdf
    • http://portaldo.eu/contenuti/upload/file/dodekatepuxikenatomaxa.pdf
    • http://girisimcilikproje.com/resimler/files/jobelapikofado.pdf
    • https://guptajimarriagebureau.com/userfiles/file/58395270505.pdf
    • http://caytrong.vn/Images_upload/files/2402260914.pdf
    • http://alacarte-design.de/userfiles/file/vimonunukivezukit.pdf
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/53610891846.pdf
    • https://jackinthegymtpe.com/uploads/files/202109051925537291.pdf
    • http://debseven.net/UserFiles/File/vizawexutefasemujawitavev.pdf
    • http://viviapalermo.com/userfiles/files/35835953068.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c20f.bin
6db07096dc908a7ad7a29e3113d9388b6efc4690d1cb20c59ba21f0580a6138a
pdf-font-stream PDF embedded font (sfnt) at offset 0xC20F 17036 bytes
font_01_sfnt_off0000ee3b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3B 16792 bytes