Malicious PDF — malware analysis report

Static analysis result for SHA-256 722758e49cdce31c…

MALICIOUS

PDF

74.8 KB Created: 2021-09-02 23:54:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 367d277bdb60454732a2a1bb4a274dcb SHA-1: e8826f7973f7575b0236dd7eac1a739ddfd18cfc SHA-256: 722758e49cdce31c30d77c68ac0b3fc7b026ff173798e25880a03aedab0d62b0
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous embedded URLs that point to compromised websites and disposable hosting domains. The primary purpose appears to be directing users to potentially malicious content, such as phishing pages or malware download sites, leveraging a link farm technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/1793601331.pdf In PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/2f3addc6b091cfb7226753ab53d33e01/4705212835.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/86854803206.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/dubudojapovowuginowadilud.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/bulitotubujuk.pdfIn PDF document text
    • https://oncetrabzon.com/resimler/files/29900862314.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/28031670532.pdfIn PDF document text
    • https://commonlawhouse.in/userfiles/file/17863215987.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b2afa17b7dc---68190587601.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/ce2bc975eb5544622cbe3efc79b74b25/59459394026.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/dolebivefosebudo.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/forebeborixatuzabi.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/67565869940.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/gabefimuzuleguvoka.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/22734369986.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/sorenavuk.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d962fe4816---mukobubuzonelumijidov.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160799114cf924---63280084216.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/99658353116.pdfIn PDF document text
    • http://prmakeup.com/Image/files/wabuwamosasafezuvilutu.pdfIn PDF document text
    • http://mistralizmiryonetim.com/uploads/file/zadosilevoxusopif.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/rawejezigavoludanema.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/58597f4bded966e01430a710e287cb84/28176668854.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=nonlinear+differential+equations+struble+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_off0000c331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC331 16036 bytes
SHA-256: cbdacbd53c1a1130ea3afe5a265236aad930dd5a31861edf87909e68d1e759e2
font_01_sfnt_off0000ec8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8A 10856 bytes
SHA-256: 8c02c797f44c44c3c52f024b95d79d77b61d3c3d5e0e950ca5cbf5d07241f985
font_02_sfnt_off00010540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10540 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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