Malicious PDF — malware analysis report

Static analysis result for SHA-256 0409e7f73be05631…

MALICIOUS

PDF

77.1 KB Created: 2021-09-26 12:57:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 294edc5cc777f742e11915dbae8e88fc SHA-1: 5f24be8f346a13fc7d1f3cdd60dc08b3746d808e SHA-256: 0409e7f73be05631a88f8e42268a84c8c818ab95734c3a6d456507d350b6b84f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on compromised or disposable domains. This suggests the document is part of a phishing or spam campaign designed to redirect users to malicious websites, potentially for credential harvesting or malware distribution. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cructi.ru/uplcv?utm_term=redmi+note+9s+unlock+bootloader+without+waiting PDF link annotation
    • http://lovelyspa.net/ckfinder/userfiles/files/nanulenigeginume.pdfIn PDF document text
    • https://revive.fashion/upload/files/botukodusig.pdfIn PDF document text
    • http://hmconcretemixingplant.ru/d/files/pididumem.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/74809452285.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/wotosexolu.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/f0qo8k64vefu0v3l5vlt7k7ti0/gowavilixowi.pdfIn PDF document text
    • http://bburago.info/admin/fckeditor/userfiles/file/gopati.pdfIn PDF document text
    • http://volvo-cars.jp/js/upload/files/50834293221.pdfIn PDF document text
    • http://marikitaberbagi.com/userfiles/file/18141065969.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/26788704847.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/tisasinekewiwamusif.pdfIn PDF document text
    • http://anpharma.net/upload/files/luvutitonojifepunagi.pdfIn PDF document text
    • http://byecook.com/ckupload/files/55229838013.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/94d561939076f4af6d27fcb83bfab769/99424608639.pdfIn PDF document text
    • http://fkhd.cz/data/img/92144471581.pdfIn PDF document text
    • http://haiannweb.com/uploads/files/61498783875.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/47b1360df2dd49e3dfa2c233e6dbe801/vumaturilojo.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/25429868833.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/vuzotofesidaluvupevata.pdfIn PDF document text
    • https://belitour.ir/basefile/belitourir/files/80377722793.pdfIn PDF document text
    • 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_off0000acf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACF1 16232 bytes
SHA-256: 01cd0e4798e93fb086042d610f43ddeed7bf091af48aa863f5c4a4f61b651684
font_01_sfnt_off0000c2c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2C6 18132 bytes
SHA-256: a47b31541bc3c6dfc389b21df93eb5bafd30773c7a0b41996e26af427869633e
font_02_sfnt_off0000f17e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17E 11448 bytes
SHA-256: 6f25e23790dc57bc47b3ca653eda76ac5cd835530e40fd7bde1922ace6abebea
font_03_sfnt_off00010c43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1