Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0042d33a8aabab3…

MALICIOUS

PDF

86.5 KB Created: 2021-07-19 03:24:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 5b27a0f351c8f394865ba654119267d4 SHA-1: 8fd962bf524bdc188dd8d3e86e2f935e528bc442 SHA-256: a0042d33a8aabab3b5ecda81f9905e70f9b5137b1aedf81e3eeea931474e5acf
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The document body is unreadable, but the heuristic firings and numerous embedded URLs confirm the phishing and download lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://ekolojikweb.net/upld/userfiles/file/meroxowita.pdf In PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082de09a585f---83792850468.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a10e75cd2df---44276153565.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090b9a033bd3---22796961043.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b09018fa4b---tisuvokewuxifopipolaj.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/lozizobirajofuwuta.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/sozewurivotiruwalebi.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9792e243f---20469467413.pdfIn PDF document text
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/visoderikup.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/bekitemagoni.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1d92e2e64---duruga.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/tedepomefimizobuvalafi.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3a93d54a2---wiladizasu.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/fa622dae4ad157197d1ee3b58223b386/dafiwipidawumujoparuku.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/kobukixefuwimafu.pdfIn PDF document text
    • http://davaocarrental.com/images/file/vevavuwuvapekizerov.pdfIn PDF document text
    • http://lawrence-spruill.com/clients/42275/File/vematogotaledesobidobim.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/21130116956.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/zuzatobalutu.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b578e6eccf7---46034190328.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/2393310630.pdfIn PDF document text
    • http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/46495021584.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ee2eaa73226---daxosufisebat.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/7121cac4d02dab9516fb0678158c9548/zipasitoxuwiwogar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=10th+class+english+mbd+guide+downloadPDF 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_off0000ed62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED62 17284 bytes
SHA-256: 271c108423c1f1dbbbc2d2810df2111aff3236ae95e0e8759f863afc78559152
font_01_sfnt_off00011ad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132EE 11120 bytes
SHA-256: 8b0cb9c6bbf7f454acb2120113b6e9e7282b8fcc926b32f03ae94663ace72578

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