Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfae9bac004e0477…

MALICIOUS

PDF

74.3 KB Created: 2021-09-07 20:28:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b9282bb0ca55ccf4b6e097eb5d230594 SHA-1: 6695df27ee58498b1c7c8d091ce33aea8881ee93 SHA-256: cfae9bac004e0477a94abf7869b9a4b074a7971dbeef4ba8971e515c066ad37a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to potentially compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a raw IP address in a URI and the ML classifier's high confidence score further indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution lure, likely employing T1059.007 (JavaScript) for obfuscation or redirection, and T1566.001 (Spearphishing Attachment) as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • 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.
  • 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://pc75.net/upfiles/file/1630955738.pdf In PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c1216121d---61666105666.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/3448118d181ceab02744321bbe23134b/99357065019.pdfIn PDF document text
    • http://dyneco.kr/userData/board/file/jazivujelopoguxe.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/3851355787.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/0bb15d724fa299e17679f61e12ca9e1f/23187049564.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/65827301355.pdfPDF link annotation
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d20ec7dc1b---wumivukotofepiv.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/66697139185.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/7a88b6126fb7d677e95ca4fea635f49a/jekifidivexabexukuxibava.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160778d7e37ed6---mugizewisavavijiputofe.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/setalegusubosikazukix.pdfIn PDF document text
    • http://abwlondonblvd.com/uploads/files/48699418769.pdfIn PDF document text
    • https://lazerom.pro/media/file/ravipu.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160a6eb4c7f02c---36069259678.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/84784595022.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/771adc6488cca1497ff8eba8e754d5bc/ziliguvinizoxuguba.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d17f82efb---17813284984.pdfIn PDF document text
    • http://siembra.me/uploads/files/wedijemoninisodapoferav.pdfIn PDF document text
    • http://santabruna.cl/upload/file/fipadib.pdfIn PDF document text
    • http://susasoft.com/upload/userfiles/files/bofemelorajegoduzesogomer.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/66877100867.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/cprj59tpfqu9n7q0og6p2u8md4/xilefigudesikutajoba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=intro+to+stock+market+pdfPDF 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_off0000c26e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC26E 10688 bytes
SHA-256: dcfcc30b14b609efae5ef13d6112bcdb046c7bf96ecb45ece1df752e31cce696
font_01_sfnt_off0000daf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF6 16020 bytes
SHA-256: 1f9a4aba38bd2d2457e215ff3bfe55bf8169bf57711854b6e50e09b6daea4e63
font_02_sfnt_off0001039c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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