Malicious PDF — malware analysis report

Static analysis result for SHA-256 a536ddb85106e457…

MALICIOUS

PDF

83.1 KB Created: 2021-09-09 15:57:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f3d9465c9de9e0b8066daf9e1a3704e6 SHA-1: db1e0afe91d88d8209c556505f4f67eadc0a5f18 SHA-256: a536ddb85106e4575595d436dc6ffe2f87e6c326cc4528edd56ecf01505326af
192 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external links, some pointing to IP addresses and compromised WordPress sites, indicating a phishing or malware distribution attempt. The presence of a 'download button' lure and ClamAV detection further supports a malicious classification. The embedded JavaScript likely facilitates the download and execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 https://garglob.ru/uplcv?utm_term=temple+run+2+new+game PDF link annotation
    • http://studiosaletta.it/userfiles/files/rogofemagipagoraludafamop.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/50231043984.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/ev1fku1od36lrf1b0pmoqqfokc/binofimuwurititaran.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/rixarekikeren.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210902125152.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/nodejesisaf.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/44563739554.pdfIn PDF document text
    • http://cardealer-space.com/js/upload/files/16223832214.pdfIn PDF document text
    • http://4chan.ro/UserFiles/file/80165771147.pdfIn PDF document text
    • http://bushurov.ru/images/files/56126666961.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/75813936151.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/91994399191.pdfIn PDF document text
    • http://landonintergroup.com/ckfinder/userfiles/files/mekalujevifux.pdfIn PDF document text
    • http://htwy.com/upload/file/38122786024.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/temuxokukidekuvegik.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210907_44DFD27DAE233992.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/73513257056.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/6899968853.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/27533885225.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/3be3e1c49cb83fb8250fdb5d8eb22e68/64605676593.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee274da3cd---59542022794.pdfPDF link annotation
    • https://efsanepin.com/calisma2/files/uploads/nabotabixezikoxapase.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/tetuzibaw.pdfIn PDF document text
    • https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/90595367089.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613066e0de77b---naliwiz.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_off0000dfed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFED 10388 bytes
SHA-256: aa730053e205f5cfd323ec78ad7243a0e80d170aa3f15eeabf62172b12828351
font_01_sfnt_off0000f780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF780 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F92 18308 bytes
SHA-256: da1dc5cb589ffef83329cb8aa401e39b06da799d21a469df295a1a817b4331b9