Malicious PDF — malware analysis report

Static analysis result for SHA-256 16cb1348c2b86991…

MALICIOUS

PDF

88.8 KB Created: 2021-09-08 12:11:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 78d29587543ca00db69d9e5def55a515 SHA-1: 2f7dc693936cb5e34f756a31e143431f70ef8df2 SHA-256: 16cb1348c2b86991c0bb3efb01fdc9fa1815c5a3b17506c511e22c38f180711d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of external links points to a T1566.001 (Spearphishing Attachment) attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/2f7679631ad52389708257a79ae87c60/1646251481.pdf In PDF document text
    • https://genia-groupe.fr/images/files/kikidu.pdfIn PDF document text
    • https://humicdp.com/uploads/2021-07-10/images/files/21608095591.pdfIn PDF document text
    • http://magicdiscoradio.hu/userfiles/file/6366038782.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/945t8a2or9027278v2u4c85iod/66614166456.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb2eb66349---90200514107.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b83fd9e530---nanadidifuxazoxakofewij.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/1631080384186611808.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/24cad65ec3a53ecacf0eb45357c2b205/gigukiwor.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/35921630321.pdfIn PDF document text
    • http://cavusofis.com/images_upload/files/85320492671.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/kosizebete.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/7c654f883fe4bfe6ebcb084ee09d376e/kebovonal.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/bixab.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/sexunamimufemiwopat.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/qa0ga5frkkmbbn070ske019hiq/tadiwa.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/fesojagekepado.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/31681305427.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e10c40411f---sukowetokoxuvaranofofile.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/9155227354.pdfIn PDF document text
    • http://klinok-saintp.ru/files/mikezebise.pdfIn PDF document text
    • http://phelieuviethung.vn/upload/files/55229752779.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=communication+system+interview+questions+and+answers+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF313 18416 bytes
SHA-256: 79e02cf629d4b9e3381952c314bcab8e11c1fcacf4691c32fe6de5cb3cb052c7
font_01_sfnt_off00012316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12316 11276 bytes
SHA-256: 19e1c22d07dc0b32faa14917c83c4aa89954b0e7bad4627f0cb2e22818a28c8f
font_02_sfnt_off00013d76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.