Malicious PDF — malware analysis report

Static analysis result for SHA-256 8553597b0460da25…

MALICIOUS

PDF

86.3 KB Created: 2021-09-18 07:59:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 50ce159f7a5a3899cc80851d8b95455a SHA-1: d07226ed3d4be921bc75fcd9fc0e92aa55557520 SHA-256: 8553597b0460da2532f23bafbffc44144e1b9ba5dac8fd329c09b330b31b12da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or redirection attack.

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 http://bielwod.com/userfiles/file/tebixezunalezudazit.pdf In PDF document text
    • http://educaholistica.com/resources/img/imagesck/files/37438542202.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/timaf.pdfIn PDF document text
    • https://dichvuhappyhouse.com/upload/files/94846959610.pdfIn PDF document text
    • http://closehorses.com/userfiles/file/sujoxusifavajanonofuri.pdfIn PDF document text
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/najelemutasopewavit.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/16788878679.pdfIn PDF document text
    • http://giayviettri.com/img-ftec/files/tuvufedolinawazinezep.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed9564c7fa---xuxinasilimolaniba.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/kaxifaxotajibukifogujim.pdfIn PDF document text
    • http://dsagco.com/Upload/file/rumawebinopudiwinezimelor.pdfIn PDF document text
    • http://smsgurugram.com/miet/assets/files/gabepa.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/62ljdt1dfmjnn0ci7u1nf6hofg/dorogad.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7d9469f5d---sasekelejexepa.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613cad8677555---37893391987.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/repovarefutomi.pdfIn PDF document text
    • http://canoeing.by/pics/files/dogopoteno.pdfIn PDF document text
    • http://taihegas.com/filespath/files/20210917035835.pdfIn PDF document text
    • https://emmaushuis.org/pages/95123970134.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16131c7c7f338c---vazovosepilu.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/07f0d1772a3459319af0520e9ff958d1/86828669137.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/mobinarogugowina.pdfIn PDF document text
    • https://shiokuda2.com/contents/files/26820717010.pdfIn PDF document text
    • https://livewireeventz.com/userfiles/file/pepekulemadikiv.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/59882688433.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=fast+and+furious+8+full+movie+online+movierulzPDF 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_off0000eb0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0A 18012 bytes
SHA-256: fd5094e41e8ec2defdf7550b791a411ea07310abf01412d6bbf4d171c10141f3
font_01_sfnt_off000119b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B6 10924 bytes
SHA-256: 4885a45e5947f5efb644e48bad61ccd435b2136d9f5338efcf84aab8b004905f
font_02_sfnt_off0001330d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1330D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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