Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a651a7c610a3455…

MALICIOUS

PDF

81.4 KB Created: 2021-08-06 00:22:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c1441681722dbde9e7e7e79d33220ecb SHA-1: 3253391508476ebb1be06c7fdc4456e6843741fa SHA-256: 2a651a7c610a3455989a3cb31273feb82fb6c77c4255a8b5201605f8130a28ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to multiple websites, many of which are hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://effektfilm.de/files/file/68407270675.pdf In PDF document text
    • http://rszm88.com/upfolder/e/files/20210725144717.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210707172221_1731416546.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/rh1679l2bpp0fi3m6sgt7uh4av/dewodugoputibubaj.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f2c0ce710c2---zozugonegad.pdfIn PDF document text
    • https://actor-conseil.com/files/file/53133979518.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/supesumaj.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/nfp0e00p0dgg6lmh2fsumrrhul/kulewodek.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/1239e291905b493fc6ecc76f070b2f4b/kupitimirasuwodumixofel.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/fivun.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/85486405281.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608510e281225---tadajonoxujimi.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/34234130487.pdfIn PDF document text
    • https://impeka.lt/components/com_mijoshop/opencart/image/data/files/18567830230.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/58696398059.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/javodudemosuvodudexul.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/5dhva1tk18j4vuln2peq1b9mq3/leweb.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/sojiwotanosediviweje.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/06/files/210628153036.pdfIn PDF document text
    • https://psychotherapie-coeppicus.ch/userfiles/files/1662250419.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/tolabolelovanej.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b02d997de4---nebed.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/jaxerolup.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/161024fc0211b3---xogadipizurikojufopago.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=saregama+carvaan+5000+songs+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4CA 16144 bytes
SHA-256: fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516
font_01_sfnt_off0000da49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF260 11008 bytes
SHA-256: 755d6eb2aa9fc0350f2fe9dc9b47c261750885773227175b8e6b41a5187b79e6
font_03_sfnt_off00010bd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD3 16708 bytes
SHA-256: 8d94ebbe91de6833d54bf0f42194825a4afc78ab37396e03987ceb3d71d2312b

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