Malicious PDF — malware analysis report

Static analysis result for SHA-256 140a4dacbf3eedcc…

MALICIOUS

PDF

75.3 KB Created: 2021-09-18 20:46:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 74f1120d86a2d906e7bdd619909c78da SHA-1: 893e63f401c09fcb9add9ae8804a028c94d01517 SHA-256: 140a4dacbf3eedcc7335f3165e50c376d7ce12adc05eea2061bc7e742515094b
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by both ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose, which is likely to redirect users to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://cructi.ru/uplcv?utm_term=hd+hot+wallpapers+for+android PDF link annotation
    • http://gemculture.com/userfiles/file/76464483557.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/vefilupujarajojevibomi.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210909160349.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/lexirejowonijitesofete.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebee9b2b99---80159818694.pdfIn PDF document text
    • http://citty.org/images/uploads/file/wotozukepizadaxomolum.pdfIn PDF document text
    • https://halkum.rs/files/lezulivilovudeb.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/jopilufixewufumejo.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/63732626603.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/83433287784.pdfIn PDF document text
    • https://oncetrabzon.com/resimler/files/21402402547.pdfIn PDF document text
    • https://kawanmto.net/contents/files/41640702717.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/54360152302.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134834919024---rajuxevunirimiton.pdfIn PDF document text
    • https://polaria.cz/images/file/vixidovikomuno.pdfIn PDF document text
    • http://yongqingtech.com/d/files/34429308816.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/52986354940.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb7f99f2a1---didujejipavipizoteviz.pdfIn PDF document text
    • https://gad-elhak.com/userfiles/file/menuzuloravenoxixif.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/24273508803.pdfIn PDF document text
    • https://aviseco.ro/userfiles/file/bajanisulufadolipi.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/bolexiradewir.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/lubafaboluwawedow.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/nanafazabepej.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC213 17436 bytes
SHA-256: 88d5af85e465bf96f2194b1503d5bdc68b232db61f234b040c1e9711ed02ea66
font_01_sfnt_off0000eef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF5 10672 bytes
SHA-256: fbbd026168ac5ccd6d9203c6654d60913e256049a09e6f0d9214d4feab998ef3
font_02_sfnt_off0001075e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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