Malicious PDF — malware analysis report

Static analysis result for SHA-256 56571c786882b063…

MALICIOUS

PDF

83.6 KB Created: 2021-09-05 21:23:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 19fefc093d4801ebb9b81d2d0994ca82 SHA-1: f6e90d1ec4f10736fbc30c54434606ecc416e8a1 SHA-256: 56571c786882b063f1aba955a1f0e9e22bb88bc257947cf33fc9835c6efa9be0
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple compromised CMS upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. The presence of numerous links on potentially compromised sites suggests an effort to obscure the true destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/bac1a75efb888cd091dcb985c2bdae99/zuzijurujorexexibakowexa.pdf In PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/hlveomb8fng0qj9rn06f2atcet/35202862083.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/zolige.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/1bof83vifdgorc92h2qadv1f70/19959152790.pdfIn PDF document text
    • http://celiapopememorial.com/clients/4/45/45605e685ba8a3b32f56966823665796/File/98587848476.pdfIn PDF document text
    • http://alexandercdg.com/clients/36029/File/vukibonixizet.pdfIn PDF document text
    • http://stonepigments.com/userfiles/file/95535325750.pdfIn PDF document text
    • https://wasserentkalkung.at/ckfinder/userfiles/files/jugodosadipizorukedejen.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/bumapobija.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/pckocdnms79gn2249vc5cl3tk3/zozopumofovaguvi.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/44274883850.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/21b00a45124607dac39ef86b9a9ee416/futeve.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/nivebotujudizoni.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a22d08aa76b---gimavivawepuzu.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/jvh2sk2bk0a1e756fdvnn39c0c/16391724898.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/pofedipeku.pdfIn PDF document text
    • http://iccarrentals.com/files/file/zazagalagimiwizibimudo.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ace2844d259---52353629219.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/nulagorepejodebupogipi.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/xenotozidogefoj.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d1c4c6da4---27521121387.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/5525367591.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/muxoderarisaxumezepogug.pdfIn PDF document text
    • http://jfe.hk/userfiles/33955098621.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/54013795000.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=convert+pdf+to+jpg+in+adobe+acrobat+dcPDF 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_off0000e140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE140 17508 bytes
SHA-256: 8f21cd5dace583e73d737f1d26018f147db7d6397002742fb2edb0de6c70782f
font_01_sfnt_off00010eec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EEC 10948 bytes
SHA-256: ac8c4354570ac7267240d5eb3aeabfa0ec6a45fa672fbb5876950ec14505c6fd
font_02_sfnt_off0001280a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1280A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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