Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea29dcf2424fc9e1…

MALICIOUS

PDF

85.3 KB Created: 2021-07-20 14:55:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5983f748c6c588d809686057a1787580 SHA-1: 0a55687cb6d727cfb4b31f89c89a90dff730fc6c SHA-256: ea29dcf2424fc9e1eddda72c515c97d9f70c78d39794131c3465e9ff2f068fa8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to compromised WordPress sites, indicating a potential phishing or malware distribution campaign. The presence of numerous links on disposable hosting and the use of UTM parameters suggest an attempt to obscure the true destination or for SEO manipulation to lure victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b4943201f14---94517304237.pdf In PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab18dca6cb9---lavigexik.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/wijadurerinakopuxot.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1d1b276ad---fadapozakisuziwalenubika.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/ninesebun.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/jfp315227sbci0j3gq99nkcbp3/50365628599.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/dojusikosesipa.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210514093356_1290218466.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/bafb8294bf471d27af9e59483754d3f8/jogowososudidunixozol.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8845c17bde---65516445849.pdfIn PDF document text
    • https://le27.fr/docs/file/98627894993.pdfIn PDF document text
    • https://childrencareandliteracysociety.org/userfiles/files/42542976668.pdfIn PDF document text
    • https://ivanamihic.com//files/napakodo.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/8l32753hb2t6573c57sc8d1c1r/71045182656.pdfIn PDF document text
    • http://blissworldbeauty.com/newerac2c/userfiles/file/tepuwotedepopij.pdfIn PDF document text
    • http://soflocops.com/clients/67403/File/73981466539.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/20133577594.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/jiwajomosolasawunapazas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=no+mention+meaning+in+tamilPDF 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_off0000ea86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA86 10160 bytes
SHA-256: 755eb906a4ab160e3d299f9c27370dde56cb2862ed3ae8dd5638d52be1f1065e
font_01_sfnt_off0001012d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012D 17880 bytes
SHA-256: 4938be072c62dcbc1bb5c5ce90e6c4b6c8f1700819c39e817019444d7c2a992a
font_02_sfnt_off0001302a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1302A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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