Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b0861983a4b94a1…

MALICIOUS

PDF

82.6 KB Created: 2021-09-14 20:34:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 85fb2ba7a94dd956fc2b2c7d5f0f2cf9 SHA-1: ebc4c9a3666628880a598108270cbf939ef4de16 SHA-256: 3b0861983a4b94a15c661c50abd025c77efcc356335966be2cdd3a252df2b829
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and link farm heuristics suggests the primary goal is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huntic.ru/uplcv?utm_term=discrete+mathematics+notes+for+computer+science PDF link annotation
    • http://relaxzenter.com/uploads/files/pekisaselowasukikuxivek.pdfIn PDF document text
    • http://antasboru.com/guvennet/resimlerfiles/78277388800.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613b040cd3f88---xodazitowepasarugutasowad.pdfIn PDF document text
    • http://philboyd.com/23439280854.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/tejikejizefejizafirato.pdfIn PDF document text
    • http://tg-focus.ru/userfiles/files/58934758954.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/ranozovipasadog.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/lanumamulap.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/13231983966.pdfIn PDF document text
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/67081254663.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/kizupejajuxafuvikovom.pdfIn PDF document text
    • http://zensushialiso.com/uploads/files/soxozut.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/kagikapirorere.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/8d8ecd507a15be937fffd3d4cec7028e/42144650505.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/17593544596.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cdb5c17e5e---lonofaratanosukibulusef.pdfIn PDF document text
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/27438023862.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-9-1/20210901070830943586.pdfIn PDF document text
    • https://littleitalypizzany.com/nbloom/fckuploads/file/fugojifugotaminezategili.pdfIn PDF document text
    • https://aecvfcom.nrgence.com/upload/userfiles/files/kuwavalabogekexagavutane.pdfIn PDF document text
    • http://amadesafar.ir/basefile/amadesafarir/files/kubokorosatufujozikevodek.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1612ede471ca0a---56569327916.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613528a13be19---mazuguxuwi.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/26412193653.pdfIn PDF document text
    • http://zzquansu.cn/d/files/65391930491.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_off0000de2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2D 17564 bytes
SHA-256: 5e26702391a3649283a514f1fb69d9807e85034a1b5ba38ba9da1889b5e85dc9
font_01_sfnt_off00010bce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCE 10800 bytes
SHA-256: 6e580d1f8d05d4e9d567709ffc43ff5ae610e79f680e5621f06edf890dacb954
font_02_sfnt_off00012486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12486 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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