Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c9d1c6bd5cf1762…

MALICIOUS

PDF

85.3 KB Created: 2021-07-02 06:55:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4d9bcc33ea3e2992e0bb67af085529c5 SHA-1: 32957be0700dfd817d7ef5231ad085be1214cb6d SHA-256: 3c9d1c6bd5cf176273b2b9c542423e0ed8963694e710f62b5bf34eabab677a32
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attack pattern involving external resource engagement.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 https://samavetpharm.com/userfiles/files/59426308550.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca75a5e9c3---63799207968.pdf
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb2ded9671---58438010060.pdf
    • http://capmar.eu/userfiles/file/48409866910.pdf
    • http://adveotec.com/img/file/pigupujokew.pdf
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761f6cbeb60---99538096174.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/j5ihn34bcdot3ron6vuj054r43/xuwipizosafi.pdf
    • http://appletechsolutions.com/userfiles/file/84277392416.pdf
    • http://ambulatorioveterinariocigliano.com/userfiles/files/xevururonoxoludizud.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbde2da43a3---68361216239.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/6ed2np0dhupqk589kk3j20aqv1/sipugegew.pdf
    • http://hyunbulsa.org/~ewedd2/userfiles/file/38706435762.pdf
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/7111f97526353e376ce526a41b39cb00/miwomesemawekapalif.pdf
    • http://jvcc.cn/ckfinder/userfiles/files/210608062501332352jfse6.pdf
    • http://nowyhotelik.pl/userfiles/file/71596663121.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc8622bb0a---20437430721.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/ocuq7lfb7cqrrhl5sng0lhjek3/21627132698.pdf
    • http://www.tobywells.org/media/fckdir/file/29555328270.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d75e4c401c5---39846808345.pdf
    • http://teplospectr.ru/images/files/teratajulabodupanax.pdf
    • http://wintec-samu.hu/uploads/files/84135667692.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada082ca6bf---wobotexumobetarodinupekil.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/g12vc2mltjlc1vf1icekki0of0/vuburoru.pdf
    • http://xlsferrosilicon.com/d/files/wigoremifalasanob.pdf
    • https://holocaustresearch.pl/nowy/photo/file/fefiwiwipe.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=hidden+picture+color+by+number+printables
    • 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_off0000e905.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE905 16792 bytes
font_01_sfnt_off00010117.bin
9cebf62249212587a44bf7e41f0cf8889b2e327abc593333d8f041bb0e9b41d8
pdf-font-stream PDF embedded font (sfnt) at offset 0x10117 17220 bytes
font_02_sfnt_off00012e48.bin
ca88c6ca28aead287291fa457e8c790dbb35b11807c463c6847bc93a40f90b11
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E48 11020 bytes