Malicious PDF — malware analysis report

Static analysis result for SHA-256 37d67d35c0338ee6…

MALICIOUS

PDF

74.7 KB Created: 2021-09-11 21:27:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 17636d4bf3a2ccac0b57ae840d7aba0c SHA-1: fd4850473761c756204423cf1d5f88733e2e110e SHA-256: 37d67d35c0338ee6fc4ad91fd8d323c2a013b009f8e88e75de293a35d4a548d0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for delivering malicious payloads or redirecting users to phishing sites. Several heuristics indicate the presence of external URIs and link farms, suggesting the PDF's primary purpose is to lure users to potentially harmful websites. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • 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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://archism.ru/uplcv?utm_term=android+studio+source+code+free+download PDF link annotation
    • https://securitydm.rs/slicice/file/baxifi.pdfIn PDF document text
    • https://ratodua.com/contents/files/nasedowuk.pdfIn PDF document text
    • http://avvolodin.ru/upload/file/sajufejinirupog.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/vizajigurubasun.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/5925782498.pdfIn PDF document text
    • https://onlinendttraining.com/files/56539749129.pdfIn PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/kiwizegatopevam.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9b471f398---binomagulasag.pdfIn PDF document text
    • http://rideco.hu/upload/file/jitesinil.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/2f7ef2beed7dcecfb54fe55b6b65af0b/708707170.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/9dfe44de2ab7af787a71508040d8a49a/50683364753.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/koduzuvuvomav.pdfIn PDF document text
    • https://coluer.ir/documents/file/vebosexevibanobuniral.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139cb1f7b9e2---36053047196.pdfIn PDF document text
    • https://edusfera.pl/upload/file/82536995249.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/73278433459.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613291b9e1a0a---sununufesowogexu.pdfIn PDF document text
    • https://ofly.om-digitalsolutions.cn/upload/files/65220428620.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/nerifavowizovumite.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/pexiguxulenajejoxixujoj.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/nuroduwerurutipatunofor.pdfIn PDF document text
    • https://makenie.com/upload/files/tozojavo.pdfIn PDF document text
    • http://hvezda-pardubice.cz/files/file/nexakozikumiromubum.pdfIn PDF document text
    • https://cobrawire.com/userfiles/files/novekemeguwumu.pdfIn PDF document text
    • http://tokyo-sanritsu.com/userfiles/file/37616631189.pdfIn PDF document text
    • https://intersensor.ro/v2011/Files/fck_upload/file/78576434580.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_off0000c4d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4D0 10636 bytes
SHA-256: 7fe9bae4f5f9f594be89da08fec418db3f156ea892fda37e93ba6c3ae418d8ce
font_01_sfnt_off0000dd67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF579 15608 bytes
SHA-256: e90d689cd0e9c7c8602738d8c69e7d4c6ede81ecc6c6f00c0fc46771c8c44fbb

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