Malicious PDF — malware analysis report

Static analysis result for SHA-256 283a7355f650fbcf…

MALICIOUS

PDF

84.9 KB Created: 2021-09-05 22:32:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 06e6bdf8dcd35e005a7aeb1033b0769d SHA-1: 6c3994eba045d058a24ca1a94c70c195e2e5042a SHA-256: 283a7355f650fbcff68962d2dd4c2fdf4e958de078be9075b81725b6445b932c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a phishing lure that attempts to trick users into downloading a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://synerhu.ru/uplcv?utm_term=engineering+geology+by+n+chennakesavulu+pdf+free+download PDF link annotation
    • http://eviljoy.com/UserFiles/File/61097078692.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/kiniwudapaworixiduz.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///damolof.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2c32f190cf2db8a3bab2ec8834dcf436/tanoremawagurevalozixem.pdfIn PDF document text
    • https://www.asoriofrio.org/ckfinder/userfiles/files/minesilijuneg.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/6a93262ba2e881dd0c504e780f0f002c/53637477330.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/j8rseejvg01gu0qiihto9bajp7/rigomufofojotaxapiri.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/hopipconr5s0g0qqquppo67pi4/6838128976.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ca4caf5f4c3---nowixalezegebijoposofumu.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/81694549801.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/4b43e2d0dce7088f1b73a4cbbb20a9c9/kukenugagufatapufubifevej.pdfIn PDF document text
    • http://yaan121.com/uploads//files/202107292347023295.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/242a239683f5d0ed72cb1e8a1d6f5be9/25032640905.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/nobuvula.pdfIn PDF document text
    • http://www.somdattabasu.com/fckimages/file/dowazu.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/78859955893.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/xirorafo.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/19874456552.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/161262d517e3dd---soropapetogitudonumuj.pdfIn PDF document text
    • http://co-mit.com/uploads/files/femekipavuligabagezuwokaf.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/d3796b64a2e8b4a06388c8786d5eac8b/fovizalorepojevagig.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/d30a29866e069c62eeb2b0bebc78da79/faxoduf.pdfIn PDF document text
    • http://etyekilovarda.hu/userfiles/file/zabozepavefo.pdfIn PDF document text
    • http://zussobrance.sk/grafika/dokumenty/30515627224.pdfIn PDF document text
    • http://cichanski.com/Upload/file/89338175755.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841e3c73c5c---mivujekaleta.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_off0000e34c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34C 11380 bytes
SHA-256: dc36cb2c3a7ee5e42a8bc0dc74deb70f146533c1d515fe6b17fd1b47298ab98c
font_01_sfnt_off0000fda8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA8 18312 bytes
SHA-256: 907c7f2e9246b0bd53b1acd5e2cf7d185f00e9e8e75b325ee5c9f74d7b88fa65
font_02_sfnt_off00012d03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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