Malicious PDF — malware analysis report

Static analysis result for SHA-256 de72bb74a9a57005…

MALICIOUS

PDF

79.9 KB Created: 2021-09-03 15:45:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6329930e1177d02bc6e7f3f1771b719e SHA-1: 025730b980cb7ce25ec766188b749191d4426096 SHA-256: de72bb74a9a570051b5bbc696ee8effacff997c6e12210eb7e99245eb26633ef
156 Risk Score

Malware Insights

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

The PDF document contains a link farm with numerous URLs, many pointing to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links to potentially malicious sites suggests an attempt to lure users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://tulga.ru/editor/files/wodosilefowinorifafez.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c969be80aa---16331267373.pdf
    • http://ajisushionline.com/uploads/files/furesukebemanajuvus.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160de5abc02d37---74700172668.pdf
    • http://hkt-optics.com/hkt/images/userfiles/file/85592175734.pdf
    • https://viadagio.be/userfiles/file/97625458569.pdf
    • https://ideylia.fr/uploads/file/18305598985.pdf
    • http://ivankotov.ru/img/lib/file/barajidimajasexifalubatu.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/1l8p7jvna7j0sgdmtts1o7633a/82279149684.pdf
    • http://bellamy.tw/uploads/files/202108150556107273.pdf
    • http://elitvorota.ru/f/file/pofezasijuw.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/gmdcj8b2f9cc6o0uh47l5pa8uo/57664205293.pdf
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16099f1463a926---91495320149.pdf
    • http://liddellgaryfamily.com/clients/863293/File/najiborufasojoxasu.pdf
    • https://aprenda-atdi.com/uploads/files/93331156880.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160f23cc2c233e---futakupobimim.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b182104da8b---pujujofib.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085412d3f6d4---92255441830.pdf
    • https://rowanmkt.com/Uploads/ckfinder/userfiles/files/momase.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/b2ae6047d6feb1735d9e566e9b17e442/sixekikufebibupejumag.pdf
    • https://www.syria-report.com/sites/all/libraries/ckfinder/userfiles/files/56536430355.pdf
    • http://budohurtsa.pl/userfiles/file/wugilomowulomujutigipejo.pdf
    • http://pinzimoniofiumicino.eu/userfiles/files/dusololawoperilusujireba.pdf
    • http://hugslock.com/app/webroot/img/files/6779981546.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=chemistry+project+to+study+the+adulterants+in+food+pdf
    • 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_off0000ce04.bin
ba01c404b14144065ac7946c27bc664f6a84e3e3ef5d1dbf7b0e2b0856342397
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE04 18888 bytes
font_01_sfnt_off0000ff06.bin
175f9b7f17c67d45d7342b9ce6fe3812b15dec2931fcff268ffcf8061376b612
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF06 11260 bytes
font_02_sfnt_off0001193f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1193F 16792 bytes