Malicious PDF — malware analysis report

Static analysis result for SHA-256 c70ff6cab569014c…

MALICIOUS

PDF

86.5 KB Created: 2021-09-03 10:08:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1fba80bfcd227a73492201e8e64e6cfa SHA-1: f5c91218d397fa947658d25450f1641448b90f75 SHA-256: c70ff6cab569014c2a8024ad669ef83d9846c99f2ce58aad372de62f8b81a837
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as a phishing trojan. The document body is unreadable, but the heuristic firings clearly indicate the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/phvg59c760s9jblsv6jprf8nrl/12151177565.pdf In PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bdb1a8bb05---puxutaxutason.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/7mccjq7cq2pu41s9896bombq8j/41607882252.pdfIn PDF document text
    • http://tnhmc.com/userfiles/file/35521221470.pdfIn PDF document text
    • https://hoanghaie.com/Images_upload/files/28482669002.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/actpp397pk6tcielt4iigqia32/14845600723.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/o0dmeuiqrivrvsp94k476l1k63/70358888735.pdfIn PDF document text
    • https://reniuved.it/file/70679108139.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16087bc40e7bd6---87806771598.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/82354612244.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/fadobetarinenafoxowakafu.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a0da05768be---50781550557.pdfIn PDF document text
    • http://chpcentre.com/files/file/90240160441.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/94910244800.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160905884ec6ef---tixonebaniterix.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/52749442108.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210818122552.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/darujonajojatamano.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/11412226495.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/6a76a6a3ccdde04c2bcecba97c932505/wekepowuzofavun.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b06683ac675---xukizijevoxaxezi.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/rolimogoxevebevidiwelap.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/6c6b8c4285435f5b2cad638acc2ad8ec/83824568495.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/qnsni0978l3j2gqd4ftghe4898/jumuxutasafizevibawuzevan.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acee835de71---18153217750.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=maharashtra+taluka+map+in+marathi+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_off0000e7ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC0 20364 bytes
SHA-256: d5c7f71944afbec2743935c2bc68582d5bb23e667ce8556cdc66b66af6f904c7
font_02_sfnt_off0001345d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1345D 10696 bytes
SHA-256: eb2f719db0918e53d83fc4e5313b3f6e221c60a6b4cd395e532f36b8d8f633c6