Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d18dadc8d629be9…

MALICIOUS

PDF

85.1 KB Created: 2021-06-25 12:19:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 391277cd92ffa2fd12f41ed9efbbc1dc SHA-1: e2c5c0d22cefa15e25c4fb5140e9192762212ff6 SHA-256: 3d18dadc8d629be94ac25fed9f38adab607d6256a5ff77496e536b3387dd1394
156 Risk Score

Malware Insights

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

The PDF contains a link farm, directing users to multiple URLs hosted on compromised CMS upload directories. ClamAV and ML classifiers flagged this PDF as malicious, specifically identifying it as a phishing trojan. The presence of numerous links to potentially compromised sites suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/4d337f4fd65b85f07bd071f3ff6a090d/44349880636.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a19ebb7ca0---68931399873.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866459526a6---71653234319.pdf
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/em054rc7sfvu5so5d0s9rvrpu6/67901544952.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1607081a915767---xewesegonekajogarobo.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160839a2e97029---45544714201.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/4ec2e490e164256dbf293c09de921fe8/30935322606.pdf
    • http://eau-msu.ru/ckfinder/userfiles/files/10852433234.pdf
    • http://imssp.by/data/images/fxeditor/file/12482756688.pdf
    • http://niestachow.pl/data/aktualnosci_imgs/file/vosevoxatamenukarat.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/2b01efa7psaiksko2dg7um6tte/limixoj.pdf
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e7295bbe8---35325127575.pdf
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/ojthlqrajr39kg3vl8vjrbee3t/zevafijizoxorugotosab.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b40152f088c---2457780723.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b17fed6f969---72465923002.pdf
    • https://alianzatours.com/imagenes/file/17804870678.pdf
    • http://iberia-ex.com/images/blog//file/56647783237.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=brownie+robotics+badge+requirements+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e817.bin
dd28eff3177c876196c52f3a126ac50108ed39f8b4fce4fe12207707d15783d9
pdf-font-stream PDF embedded font (sfnt) at offset 0xE817 17140 bytes
font_01_sfnt_off0001154b.bin
875fbc3dce2031e3e2e8c098756fd81a62e273a5f79a92ac9885a776be1c56fc
pdf-font-stream PDF embedded font (sfnt) at offset 0x1154B 11440 bytes
font_02_sfnt_off00012fb1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB1 16792 bytes