Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa822e8f05b36a86…

MALICIOUS

PDF

79.6 KB Created: 2021-09-06 02:33:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: bd92e21ca6737e85c8e6e9483b9528c3 SHA-1: b64076d39bf498c98591357165e9add369f4c30e SHA-256: aa822e8f05b36a860868013351ad084293b18573793730b3ebc9db3575702a67
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crysiq.ru/uplcv?utm_term=present+progressive+verb+tense+worksheet PDF link annotation
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/f17f3518c928dbdd8d00496e9135d578/93993888118.pdfIn PDF document text
    • http://talentfuturesservices.com/sharpinstitute/images/files/75595221370.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/vanava.pdfIn PDF document text
    • http://lottfamilyreunion.com/clients/878857/File/gisukujerabiwavewuwure.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/140172938afbe346b80d18d2ee7558d3/xilobuwefobowumesonasiti.pdfIn PDF document text
    • http://orhs89reunion.com/clients/77823/File/3297885212.pdfIn PDF document text
    • http://patp1ryb.ru/media/file/lolawegiwotas.pdfIn PDF document text
    • https://wineart.online/userfiles/file/7711737375.pdfIn PDF document text
    • https://teddybestore.it/file/xenomefad.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4da8537628---nexonuxetopozad.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/le9n9fgo6cu3ef9uv2bp6sq62r/87799349428.pdfIn PDF document text
    • https://nepalaviationmuseum.com/userfiles/files/71391846721.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160791b80e85d2---25229284787.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/90804603721.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/xivutuvekezo.pdfIn PDF document text
    • https://mednet.mk/public_html/upload/userfiles/file/lifuzopavukad.pdfIn PDF document text
    • https://aashianarealty.com/file/tobatomududona.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/jexojesi.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df4d9c3d72---20394084580.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/45976828789.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/kotofudigel.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/99173700429.pdfIn PDF document text
    • http://suacona.com/clients/16856/File/82342865512.pdfIn PDF document text
    • http://saigonradio.com/userfiles/file/jukobavidinipirabu.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/65082407778.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/12746842664.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD268 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7F 10708 bytes
SHA-256: 16092db71d4a03078aed328c8594e886e87e0da34c62cffc2936e23bf2fe9591
font_02_sfnt_off000102dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DC 17916 bytes
SHA-256: 138b902be2a1392e825dcaac07887b75d1ac061175409fbd318b7b57b89554aa

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