Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7c6778c25c4667e…

MALICIOUS

PDF

98.0 KB Created: 2021-07-25 18:37:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 8f6b99b2a9128a767b417f072766dba4 SHA-1: ca67be47ae0a3550e565680927ef846d09bf29e9 SHA-256: e7c6778c25c4667e086d94a6a1513a364df227e48fe0ce03c2253d16534e2628
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba9afd51a30---31378262561.pdf In PDF document text
    • http://simonhoirup.dk/userfiles/file/85907286353.pdfIn PDF document text
    • https://pacpartner.net/images_client//imagesfile/90709934249.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2848be8dd---41978913924.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/17591912001.pdfIn PDF document text
    • https://avenue102.com/uploads/file/8961673509.pdfIn PDF document text
    • http://change-sexy.com/files/files/gudarexovum.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/ecfee842724d5798b648c710817bad16/87236556705.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/gotamegapububuvud.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/gelonebilen.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/97685145057.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/60561127986.pdfIn PDF document text
    • https://anjingliar2.com/contents//files/vopenibogi.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a14c966f5be---fubesisagexivone.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20215302129383503.pdfIn PDF document text
    • http://jkphotocon.org/data/userfiles/files/pibefewafurafixe.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/4u84vr7p8s2chdqt5gpv8d8apm/fosotudafenapigewago.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609871c078692---14894284928.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f8cfc3d45---vonuwuxirisezosuxosu.pdfIn PDF document text
    • https://abeess.com/userfiles/file/kanunuvirexujozavopajexe.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608528526c3bd---nanezoduko.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c65ce311d13---81677158829.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864ec514f18---50409568433.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210620135103.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/850bdf18d7d3adbbdaa7d917c3be47d4/fonuzexukunuwuzemita.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=stihl+028+av+super+carburetor+replacementPDF 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_off00011825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11825 11472 bytes
SHA-256: cb8741b9792ff8307debf8e878bca445aeee611d8657a876eae7f4c7a755e7de
font_01_sfnt_off000132e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132E4 17256 bytes
SHA-256: eac3319c723bd949cb76be59a8dece52bed32aabe920b52266cbcebba99b0b8d
font_02_sfnt_off00016030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16030 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1