Malicious PDF — malware analysis report

Static analysis result for SHA-256 f85dcdcebcbe4dfb…

MALICIOUS

PDF

88.0 KB Created: 2021-09-13 23:13:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3d28f0cfd5582b717bc698dd530ea0a5 SHA-1: b2457eaf5008fd00135f1a86201d66d2e449b307 SHA-256: f85dcdcebcbe4dfbe12b0c60e14a47fcf2d7911039f4dca9239585376e06c9c8
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised or disposable domains, indicating a phishing or malicious redirection attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://o2opr.co/userfiles/files/beragavokipixerigitak.pdf In PDF document text
    • http://www.pibmg.com.br/ckfinder/userfiles/files/files/96836428374.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/tifalotuj.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/4480484156.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/f70861kpl0tjih83kck66plv44/severuzovebukekesu.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/8388242226.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/c98ce31062fcc56236d35f3dd1216363/makuwoxepibukewozovawem.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/12342942064.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/xilexafogo.pdfIn PDF document text
    • https://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/29830886970.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/patijenomuxikexu.pdfIn PDF document text
    • http://phubozena.pl/userfiles/file/banuruzuwemajawi.pdfIn PDF document text
    • http://avvocatogiuliani.it/userfiles/files/20742733212.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/vowowokoxobovafev.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/rexiwuvaribul.pdfIn PDF document text
    • http://yetisirkaucuk.com/firma/files/lopejikixaw.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/d132cef9fabd7de9c4b26ceae283e8a9/nujafomofekave.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/41422071816.pdfIn PDF document text
    • https://maytinhdalat.vn/images/uploads/files/xegamudizixujisufi.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/bomunumituwakoxorupixi.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec7063cb15---sipusimofu.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/57097434725.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=i+will+take+your+word+for+itPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d05d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD05D 18052 bytes
SHA-256: 1ef29022db7bb9ce98b5201bbf76cdf2909886775f9504de6f63db70f1709f93
font_01_sfnt_off0000ff2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11742 10420 bytes
SHA-256: ae9fc603e1e6f981f617dd4a8153373da52625cf3b9b0cbac2a6c9c57b4c263a
font_03_sfnt_off00012f08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F08 16568 bytes
SHA-256: 1eb5031869d930f00339d87a4ecd7afec5b92faae996d2f1295c0568b26a0b27
font_04_sfnt_off0001463d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1463D 2276 bytes
SHA-256: fe609abc8bd364f34c291eba26bb6af9837f45f6b1afcaf86eb8fc65de42384a

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