Malicious PDF — malware analysis report

Static analysis result for SHA-256 71a268b8e6dc46a6…

MALICIOUS

PDF

86.5 KB Created: 2021-10-13 02:18:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 49311c2824aa2515c8d482fc3792df82 SHA-1: 3f824bf7045058155e3775874dd858f2105220f2 SHA-256: 71a268b8e6dc46a6c6c74203e2685c56e7cab0f843ba5cb7d2ddbc349a2d3b4b
164 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm strategy, and the PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM suggests these links may be hosted on compromised content management systems. The presence of these links and the ML detection strongly suggest a phishing or SEO spamming attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://laborke.ru/uplcv?utm_term=igcse+mathematics+questions+and+answers PDF link annotation
    • http://www.taxivanclass.com/uploads/ckfinder/files/16459089981.pdfIn PDF document text
    • https://zlato-invest.cz/upload/files/zejomesuwejexazizedefom.pdfIn PDF document text
    • http://kovovyroba-nosniky.cz/UserFiles/File/1047054489.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/kuruxavitodefevima.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/soxuxosimu.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/46977701255.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/41857808435.pdfIn PDF document text
    • http://compufoxmail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/tisukaviwazagewigezogas.pdfIn PDF document text
    • https://szallas-karpatalja.hu/upload/dimeterorutabufukis.pdfIn PDF document text
    • http://futsalcb.cz/picture/vtextu/file/mupurusegoponeja.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/fedovediruxonowelitilogan.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/df77f08f29b2b0da3c30819a435a941e/gokakagapove.pdfIn PDF document text
    • http://veterinariacomportamentale.it/userfiles/files/31947712088.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/25814642311.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144c27ba0674---54254834672.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210918165836.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/ff0faa789fc6668d93ac7549cd434e1b/wetitugaj.pdfIn PDF document text
    • http://www.ambatownship.com/ckfinder/userfiles/files/zofobubaze.pdfIn PDF document text
    • https://banghenails.com/upload/file/8086693682.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/38217627515.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/tafelipidabumuwoxofaxajex.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///76563667399.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/ruwirowokem.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/87095276044.pdfIn PDF document text
    • http://tomboy2.com/images/library/File/bafakesi.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615c69b7014fa---27468972367.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2a46dbb4312c65937459e91ae294697d/25285732368.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_off0000ebc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DB 18036 bytes
SHA-256: ce8a7ca7daefbdde4872a5166de975934e2a02a34bd3be48c11b0fd7bf7fbca3
font_02_sfnt_off000132eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132EB 11052 bytes
SHA-256: 8d3388c4bee1e8cdee46a04836b189fc30856c19443db632fec5a16877f4aa69

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