Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1e03d7d7eb4d5e0…

MALICIOUS

PDF

86.3 KB Created: 2021-06-30 14:08:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e17873e1e2c38bfef2df2dec339e4110 SHA-1: c495998aff0f4bed8a47e5feb6f7318524808b40 SHA-256: a1e03d7d7eb4d5e043417cd40a12e1518ebeddfc560eb4eaf8dcc3cf4aa2695a
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to compromised websites, many of which are hosted on disposable domains or use WordPress plugins for file uploads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate that the document is designed to lead users to malicious content hosted on these sites. The ML classifier and ClamAV detection strongly support its malicious nature, likely as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4c9a06c50---62758193421.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4b90f40f8---zowuwuponifozekaseril.pdf
    • https://zulapin.com/calisma2/files/uploads/43843261404.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/dhtchtud6ut99p9fp55uj462vt/76347480981.pdf
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/512ca9112887f898ac2088f453a205db/9196695589.pdf
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/d7a9c271bc069c835e4937c975cbee87/67093297923.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744f2f21101.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbbe4f24c0---61317794164.pdf
    • https://bawaniint.com/ckfinder/userfiles/files/kemedolaj.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608275dde76ee---genupomeveta.pdf
    • http://mbcasc.net/imgs/file/28504086088.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098a14a0f9cd---sujodinepamodigixonaxun.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607724f774b64---bozufose.pdf
    • http://pronobile.de/catalog/file/vuxilewewofofojifozivaf.pdf
    • http://abcbyspu.net/ckfinder/images_store/files/58047218777.pdf
    • http://bannails.com/fckeditor_userfiles/file/49153970353.pdf
    • http://macautemple.com/userfiles/file/6458934974.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b3c07787f---lefifewirovuwu.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160806e2f3d3f5---vuwomoduk.pdf
    • http://sola-brothers.com/userfiles/file/nasibaxesev.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072c12fe73e8---79243266420.pdf
    • http://drapa-technika.cz/UserFiles/File/31174001897.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16095fcbc33574---gutukisofodi.pdf
    • http://medicare-darmstadt.de/bilder/UserImages/file/97981055133.pdf
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16090425186a94---90219140369.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=learn+indian+classical+music+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_off0000ef85.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF85 16792 bytes
font_01_sfnt_off0001079c.bin
0ba05b6b44f4f6d88fbe983145fa02a077cca0bb6d4eccdd3657c53d59c9390b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1079C 10620 bytes
font_02_sfnt_off00011fc5.bin
7fc9c2939e6e9d2a80e32719a24e66566d3f45983b811ce309a011b1039a3e7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC5 17008 bytes

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