Malicious PDF — malware analysis report

Static analysis result for SHA-256 571923b1d0fe6ef1…

MALICIOUS

PDF

84.2 KB Created: 2021-09-17 20:21:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 856e43a20165abd3d50b16577131289c SHA-1: 2a81a8f719617ac6015168a08ae99719e993ac6d SHA-256: 571923b1d0fe6ef147d83df897cb6ca4a932cf7a9681ad1f05c48e35cf93088a
172 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and presents a link farm on compromised or disposable hosting, disguised as a download button, which is a common lure for phishing or malware distribution. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://crocepadrekolbe.it/userfiles/files/loladulizafigodazevitaf.pdf In PDF document text
    • http://culfordequestriancentre.org/UserFiles/file/wuzasuwenivoleberirenur.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/oa2p4ummkq8liganknq5e206mj/10019616604.pdfIn PDF document text
    • http://fruhmann-elektrotechnik.at/82128737518.pdfIn PDF document text
    • https://specialgarden.ro/userfiles/file/jisawibisagedibami.pdfIn PDF document text
    • http://lednotice.com/userData/board/file/kekeb.pdfIn PDF document text
    • https://halkum.rs/files/66257785439.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/gujekusumorapinudokuk.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/86968267295.pdfIn PDF document text
    • https://gangnampools.com/contents/files/zirazigufeburusagateba.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/pinitimedizemux.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b0b0196e57763e74f3da9928ef69c2bb/saxibugeg.pdfIn PDF document text
    • http://jadeite.ru/images/file/mifanusitijuwekiran.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/57586324347.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/tituramimosokiligulis.pdfIn PDF document text
    • https://masihpt2.com/contents/files/gedurukazij.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/40aa9203201b8065853b2463b04c1bde/99135608166.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/80922328498.pdfIn PDF document text
    • https://invest.pl/userfiles/file/42239095802.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161409a8741e71---wowifejoxufolosujawabuzev.pdfIn PDF document text
    • https://clickbox.ro/images/file/25665209039.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16136d8f24591f---tafiwobesajav.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/23299754764.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/kipepipu.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/zefafasorubowogitivupuwo.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/gibibe.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/93983243628.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=all+video+downloader+pro+apkPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D2 17120 bytes
SHA-256: 102d527b0393f3e04ba0551d4081e419233d35ff6807678948957db8c319739c
font_01_sfnt_off000113af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113AF 10344 bytes
SHA-256: 70ab0b905f6f5da986e694e452269ea326d2bdfc23c231dbe76f4a975f300d0d
font_02_sfnt_off00012b24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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