Malicious PDF — malware analysis report

Static analysis result for SHA-256 41a5f6ee7b13b625…

MALICIOUS

PDF

82.7 KB Created: 2021-09-09 18:11:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: a7ea4c74db107861f4d14fddffc6d979 SHA-1: 53b33e2490cb296505d751f536193227af884bb2 SHA-256: 41a5f6ee7b13b625383b3cdd5b35c5ad83df2152a03921b3919ec21f75d2df79
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics suggest it functions as a link farm, directing users to potentially compromised websites or disposable hosting, likely to download further payloads. The presence of a 'Password-protected archive lure' heuristic indicates the document may instruct the user to open a password-protected file, a common tactic to bypass security scanners.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://garglob.ru/uplcv?utm_term=java+gson+download PDF link annotation
    • https://wtmasonry.com/ckfinder/userfiles/files/79884933665.pdfIn PDF document text
    • http://dreambeauty.kr/upload/fckeditor/file/78993227875.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/17601129493.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/21550295094.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/f90ab45684536c99bff1252024a8e860/10111917182.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130bf4cec665---kilogutanoburisopodik.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/petutiremelagukuwa.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/xirovokuki.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/megowifedoxofezanukitike.pdfIn PDF document text
    • https://fond.ru/userfiles/file/96356767531.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f36802325b---zebel.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/18068351675.pdfIn PDF document text
    • http://proxima-online.it/public/file/2037065810.pdfIn PDF document text
    • http://htygroup.com/upload/files/maxowupuvaxewibigobogimex.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/rudajegovasakupuv.pdfIn PDF document text
    • http://dream-mebel.com/pic/file/9599610179.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/56925872191.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/vumonikiwumorug.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613147b1dcce3---69831375749.pdfIn PDF document text
    • http://xn--9n2bn9mz3aba29g44r4o0a.kr/fckeditor/userfiles/image/pikexobovekejimuvuxibaw.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/likikasobumonera.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/lumopa.pdfIn PDF document text
    • http://cuanhuadanang.vn/uploads/image/files/piximomafuzugupok.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139841064060---32930045083.pdfIn PDF document text
    • https://questyme.com/userfiles/file/wumope.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_off0000dd4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4A 10144 bytes
SHA-256: 69f3c4a3c5a039334f0752430c906024c3f8153545397aab58047771f6dab75a
font_01_sfnt_off0000f3ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EA 18760 bytes
SHA-256: c6be54db24055abc1c54c2b285f395e3996774d018870bf87025aeb6313aaf0c
font_02_sfnt_off000125a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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