Malicious PDF — malware analysis report

Static analysis result for SHA-256 a862d01b132ebf07…

MALICIOUS

PDF

91.3 KB Created: 2021-07-30 06:42:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4bac6fe829acab63afbbeffd095b898b SHA-1: 94690af2f2e51e044054e444024cd681a8c1f7c5 SHA-256: a862d01b132ebf0791f2401c1d1049aa67c86bdf9c0e8a44184391a87f98f50c
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal a link farm hosted on compromised WordPress sites, suggesting a phishing or malware distribution scheme. The presence of a 'download button' lure further supports this, aiming to trick users into downloading the malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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.
  • 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://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608726ec8431e---gamipulifimiditiworino.pdf In PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b66e80569---5672779930.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/7d1221b857daea8fcc08487ae997f057/jegit.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/18005709940.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/41915514898.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/29041826537.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/bazawazufonogubu.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/56132125789.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/f260b228b0deacaec8cf072a8923b808/10724797981.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/87396966863.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/1prcrj56ho0v8848gf4106t4na/bisawemolajapijexilela.pdfIn PDF document text
    • http://lacyfamilyunity.com/clients/2/20/203fd950dafdada58ea32e7b96f0d147/File/35259864428.pdfIn PDF document text
    • https://unosms.us/userfiles/file/90507097499.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/nudide.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8fa6c3ce3---fegetiwinunurewixoreji.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4cba951b23---72058758438.pdfIn PDF document text
    • https://tsegypt.com/file/53489638369.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af001a89c9---75954758726.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/wakekolixitagu.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/61f6111f96746627bf607d9a86fc3727/72268216764.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d56be14c2---zupetoge.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=down+free+facebook+lite+apkPDF 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_off000102e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E5 17160 bytes
SHA-256: 74f85191318ee6b3ff7cfb9637b6e56adbcd926262e32dc0abdcd3be3427dfdb
font_01_sfnt_off00012ef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF5 10624 bytes
SHA-256: c051f83ab9f6916fe92cd3812793ad0f74973f31099c229c25e2f256dfce5102
font_02_sfnt_off00014733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14733 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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