Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb52ab2845b7fef1…

MALICIOUS

PDF

79.2 KB Created: 2021-09-04 20:15:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 123cf596072efadf8abc654962db60dd SHA-1: 33f87ecd289434b618b068d7d2aadc8bf98460e4 SHA-256: bb52ab2845b7fef148497dd277126f3622b6ce83e43475d82dbb7df44eedbe25
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Several heuristics point to the PDF being a link farm, with many URLs hosted on compromised CMS uploads or disposable domains, suggesting an attempt to redirect users to malicious content. The presence of numerous unknown URLs further supports this, likely serving as lures for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4e6bb69fe---52813908408.pdf In PDF document text
    • http://eska-lift.ru/userfiles/file/36552446632.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/kixaponu.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/36847684914.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608446e43f7ee---16520557197.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5257157df2---weloji.pdfIn PDF document text
    • http://piotrkowska77.pl/zdjeciafile/88259947220.pdfIn PDF document text
    • http://vanguardhungary.hu/userfiles/file/puvevepipitiwa.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/xojesakurojaxivefexepuje.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e56fcb8b21---55582996.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/peperom.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/27192601197.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/83052308446.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/43568639149.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/naxiruzatumexuboxok.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/68553553377.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/8b6d7967c8d71b6258a63b5c9607f4a2/55465714166.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/c2ba9787ec4807e7a6fd31d30684fb91/24646862545.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ff7e88643a0---56969996245.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/polakigo.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/genitod.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6c8ec272b---65616271525.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e95a0c3297c---33994688977.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/9712876989.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=libro+loca+por+la+ciencia+franny+k+stein+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_off0000cd53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD53 18776 bytes
SHA-256: 50e388ad8d83d73d22e0fd4188d2c82173d974a34bcfca97a3568d1932c3a2da
font_01_sfnt_off0000fd22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD22 10916 bytes
SHA-256: f8275fadcee56424202d592469a20a841e2ec2cf26ad8e1fd28612fea1ebb09f
font_02_sfnt_off0001165b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1165B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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