Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b0c7b926d228b03…

MALICIOUS

PDF

97.5 KB Created: 2021-09-04 18:01:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 324efbb5b99d2c16894d1c5fc27c1ef4 SHA-1: 0d3ae82d70ec434f1df403fd64d1f44be83fef54 SHA-256: 4b0c7b926d228b034e1a372a1bec330455a69c05854b48cbcc0481664e41bbb2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to lure users to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9733

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://inwebjor.ru/uplcv?utm_term=voltaire+zadig+pdf PDF link annotation
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/7ar1sdj8e0ge923r6rka27rsan/39216556454.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9e496fa70---zelebibi.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/nepiduvufixaxibetojowerok.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1610d0045b225b---zejubag.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/42719970602.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/tqakhnfl567k8bvn8gf2iukaag/72728610972.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/fefijuxezekogexexiwovon.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/ranosibuwugobofilunarano.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca0ee1ccb90---56457218557.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/nepukiralugilovigoz.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9b5a32709---dufivezidoj.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/65902210315.pdfIn PDF document text
    • http://zespolbahamas.pl/zdjecia/file/mutemuwizura.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/joxewol.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9cbce4e96---jikalotowaxoligorovujago.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/xakakan.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160faf50d5a6b3---78620301667.pdfIn PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/61903686399.pdfIn PDF document text
    • http://huyminhplastic.com/upload/files/gupig.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/d8jej202kn7de34tue74h5b2sa/98654755642.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/3a585949bfc4844962b2455d4591fb14/bonetazoxirixorogageliveb.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/bubomowakefavixuliwetizuw.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/37843634415.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/pojisipaninebedafi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f77129227d5---26507405761.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/62662037717.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D6 16816 bytes
SHA-256: a455417405aecb27694462665f67b72b03e7c17888350eecd2c521543d1a3d31
font_02_sfnt_off00011e0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0E 10428 bytes
SHA-256: 47d2c918a1fad243dfdab87db9999b542ffb7fa77622ae7c1db2f0c216907de6
font_03_sfnt_off0001359d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1359D 26200 bytes
SHA-256: c4c97e024dbda27a52e49f99354e9d59ceecec656e5f77300f9a3151cc6c283c

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