Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd0a62ae249a822a…

MALICIOUS

PDF

91.3 KB Created: 2021-07-05 18:43:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b566b7cb2515e83feea90bcae7fc91fb SHA-1: 585355762d7de059973439a91b8038d68166e5cb SHA-256: cd0a62ae249a822aa0d99d2c21c5da0a5edd34c2e57a7b37acf79760658a6024
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to numerous compromised CMS upload locations and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of external URIs and link farms indicates a likely intent to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 http://kemenyseprosiklos.hu/upload/file/76781027677.pdf In PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e783c9086b---lalatelutag.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/41548757599.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/gapexezetovomeduxowipimaj.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160910c4579637---73244280729.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160944adb5b005---70391190971.pdfIn PDF document text
    • https://stopserv.ru/files/file/bupadateretezagusal.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/4887761843.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/efsf5gt18eivbtl1l6o8v0eh0v/87229745859.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/5cb81012cd6e0f2c6eeb4660482a1a0f/gasaxezolinakiri.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/47901f6e484e073af0498b9fa38c6be1/logilefu.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812ab5d6350---xomuzobolawawijexeb.pdfIn PDF document text
    • http://sunarfactory.com/userfiles/files/towazofogajatapebo.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d579c755e---54930528987.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/3b8d81b39451c5b2b06f0fe611fbb2b9/lavesumefurexijoze.pdfIn PDF document text
    • https://badoza.net/userfiles/file/vomiraz.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b2d5030bc---jovifubugo.pdfIn PDF document text
    • http://walthamclassof1985.com/clients/5/52/52060312c10aa816a718e90a19a6a7a1/File/59817971511.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/datesamobalufevikajig.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/6cdd5ce93837b40cab10611070f46a25/rasetizovobuweta.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c951faeaad9---67177531799.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/21564959150.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/7257e54a4453c45341393482293f7395/xizuropabesu.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/21105876689.pdfIn PDF document text
    • https://sayurmateng.com/contents//files/52850380586.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=6th+class+science+3rd+lesson+questions+and+answersPDF 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_off0001026d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026D 11040 bytes
SHA-256: 247be04d0cf01e6640e5c9c2f3478add2bbc3c2f34996ab615f11ccc729f3ba8
font_01_sfnt_off00011bf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF3 16752 bytes
SHA-256: 1da46929cf8adb6218ec93f5df7eeb181c3d03957e6da747eec4682ec9c4c509
font_02_sfnt_off0001478b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1478B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1