Malicious PDF — malware analysis report

Static analysis result for SHA-256 93efac89edf629b4…

MALICIOUS

PDF

83.3 KB Created: 2021-09-23 04:17:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 65ad5668e354e8d556202c3496e548ce SHA-1: 63f49dfc05ce6579afc60136327bf85bd5cb63c4 SHA-256: 93efac89edf629b4317ddbc05c20ba3c64488658f7b63e377234c8e9a7eb32fc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating it's likely a phishing or trojan delivery mechanism. The presence of numerous links to compromised CMS uploads and disposable hosting, along with a heuristic for a 'download button' lure, suggests the document attempts to trick users into downloading further malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a multi-stage attack, potentially involving JavaScript execution within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crysiq.ru/uplcv?utm_term=scummvm+android+anleitung PDF link annotation
    • http://machinesupplier.cn/data/product/file/2021916_155314_225.pdfIn PDF document text
    • https://es21sys.com/userfiles/file/zemazetoforebibode.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210923020317.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/nonoman.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/aa87c3307b5d34f6e1f36756324600c5/37136739202.pdfIn PDF document text
    • https://12shio4.com/contents/files/rasixor.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/nazezoratoronoxom.pdfIn PDF document text
    • http://topas.lt/userfiles/file/55421732748.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/nigejajuxiwupatixowuxe.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210912012445.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/refiduzesakegatu.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/88528433534.pdfIn PDF document text
    • http://kompassztuki.pl/Image/files/81122511995.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/51397368403.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/90061871674.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613592cc6d53e---77798877035.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/zezukofoxonabekodemesosij.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/96083714950.pdfIn PDF document text
    • https://andana.us/files/files/lejuruxorudokup.pdfIn PDF document text
    • https://xn----7sbbg1ddpkdc.xn--j1amh/uploads/files/96030722726.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/5645886352.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/78884833018.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613e006cbe9e5---80324766758.pdfIn PDF document text
    • http://marklaliberte.com/fckupload/file/woxefogifikavodenin.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_off0000dab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB1 19828 bytes
SHA-256: 54b630110b8ad1efb8bf422b6aa9a506fe0b3afd72ed71b60634eb9348c75372
font_01_sfnt_off00010efa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12711 10784 bytes
SHA-256: ed1901c0768d86c609ef3ec2ac95a861841421406d0f75c269e16d1f9a5947b1

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