Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1452810edf48f35…

MALICIOUS

PDF

67.3 KB Created: 2021-09-27 22:56:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 93a9d57d53b8bbfe91865fc7872ce15d SHA-1: a36626c785421dfb28e47eb15f8e44d61e024a71 SHA-256: a1452810edf48f354513a2bcb662b3f5e935c47d60a03113c139ae03efd64b12
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing lure. It contains embedded JavaScript and a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The document's structure and content indicate it's designed to trick users into clicking through to a potentially harmful destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://myclubowners.com/userfiles/files/fulijolerumafez.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613019de1715a---64341630193.pdf
    • https://jung-yeunjang.ch/userfiles/file/63433197812.pdf
    • https://ph2020.org/ckfinder/userfiles/files/84084444742.pdf
    • https://zzwgjx.com/d/files/41833269672.pdf
    • https://hunde-katzen.at/soubory/62330677010.pdf
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/gf90etc983fao22vb14ml3jjfb/18233480102.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/u9apoth3agf5bpp65sr9k3lle6/xogikiz.pdf
    • http://vodnik48.ru/content/file/tukizejesinuf.pdf
    • http://rm-centr.ru/uploads/file/84352141658.pdf
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/53470181095.pdf
    • https://baoholaodong24.baohohoanglong.com/userfiles/file/susuliwurezujixok.pdf
    • http://movesearchesuk.com/userfiles/file/tomuvewufisirugaxeke.pdf
    • http://chirineli.com/img/lib/file/50246539455.pdf
    • http://americansemitruckparts.com/d/files/nalajade.pdf
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/fobifixewupezaxupexugirok.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/b3875c415c6a07326f029d6f296b56ee/75045394462.pdf
    • https://maisonforville.be/documents/file/69362259315.pdf
    • http://sgrdpandher.com/userfiles/file/zuputure.pdf
    • http://malbreil.com/userfiles/file/wasimikonaronan.pdf
    • http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/89644838632.pdf
    • https://carsen.sk/editor_uploads/system/files/nukuvixi.pdf
    • http://moda-minulosti.cz/docs/momin/file/90875166985.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=free+fire+cobra+apk+download
    • 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_off0000ad9d.bin
1034cca53960fd79dc769bb3c309ec7eacb3181cbecf9f3a76178b16d3675daf
pdf-font-stream PDF embedded font (sfnt) at offset 0xAD9D 10640 bytes
font_01_sfnt_off0000c5d3.bin
1f82f3b19c85245b8d63b0bc43e72ede668035fd87c3b3a59bbef916b02633ba
pdf-font-stream PDF embedded font (sfnt) at offset 0xC5D3 13740 bytes
font_02_sfnt_off0000e7ef.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EF 16792 bytes