Malicious PDF — malware analysis report

Static analysis result for SHA-256 806525c4eebb3372…

MALICIOUS

PDF

80.5 KB Created: 2021-08-21 19:55:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: a31c22000572ba9fe99589a86d151653 SHA-1: ce26749ce313569977d7b5bdb49a353a16281d9c SHA-256: 806525c4eebb337209ff1646fb8d05b48f38706cf8e674c96d54718f491eebbf
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://laborke.ru/uplcv?utm_term=list+of+enduring+issues+global+history PDF link annotation
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/mexibatasajobegomoxo.pdfIn PDF document text
    • http://willajarmar.pl/userfiles/file/5848366343.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160cab1d289d81---85684103643.pdfIn PDF document text
    • https://rivaflo-south.in/userfiles/files/vedazapuxitaxopetu.pdfIn PDF document text
    • http://togul.org/sites/default/files/file/21851847681.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/1370cbca6cc5572bcb9ffcf7fff3c680/19726743345.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/fadevisuduzibojafa.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/wafezipojazeboduzujapu.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/c8338b3c309405695feba672cfda8aee/68840069120.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/waripa.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/073e8cc7309b4a3eceec8f0b4f2e9579/70763562838.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/07/05/file/20210705_121545_148.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/7d548c7d6ae70b2db5683d883812ad41/buzoribexoloxekipapafa.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/sagifoloz.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/71c3c976f38153d775112a3e9d98c358/4006649554.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/19277617938.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/71558927308.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/10081811328.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/kobum.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/35709563228.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/07afc489bcf3f999dfc73ce5b4d52514/98537140721.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/84818874478.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/xekemobategexaxujezoxok.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/29408423103.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_off0000d592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD592 10944 bytes
SHA-256: 8ff69501ce83c809c424c28537c5bb6c8bc6eb591853237d0053af040f977f11
font_01_sfnt_off0000eeab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAB 17588 bytes
SHA-256: 54dc414353e3ad2cb36cda27a2332ecb6e611f96b752b0cd013d4b101ea2b8c0
font_02_sfnt_off00011cc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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