Malicious PDF — malware analysis report

Static analysis result for SHA-256 15f274714fb687e8…

MALICIOUS

PDF

91.6 KB Created: 2021-09-02 02:46:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1665af8b5d3298869bd4784bc6a469da SHA-1: 537f4b30626459da1987ac6b652811ae55a214cd SHA-256: 15f274714fb687e833e2389df7be1e1e56bcfd3c7dc6f80c2dc214b073307d8f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs that point to various websites, many of which appear to be part of a link farm hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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 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://medvor.ru/uplcv?utm_term=best+way+to+watch+free+movies PDF link annotation
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b863373b57b---figolag.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/9668817369.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/43b6e558ff2986ee61bfdbf1929e9343/99677318430.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d8c068c08---pinazuviwutonegesodabid.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/97347904095.pdfIn PDF document text
    • https://clubsportedinburgh.org/userfiles/files/kemubadus.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/sigeduriw.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/18195187579.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/76669735865.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/rijegepizepimi.pdfIn PDF document text
    • http://sozopolihills.com/userfiles/file/97434690457.pdfIn PDF document text
    • http://phukientubepxinh.info/gomsu/sanpham/anh/files/19595624216.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/0629c2c9447db2e1de03ca4e5373d46c/dawezeduwi.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/161096d4ebfb84---jotozurisikamimereru.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d0a853fee---loruwilinutokezikuripon.pdfIn PDF document text
    • http://thanhtindesign.vn/uploads/image/files/daban.pdfIn PDF document text
    • http://dallassymphonyleague.com/clients/1/14/14bb4a025281f1a32078cb68571f7cf3/File/xuremuliv.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/vajofefoparatunesedetu.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607006f38ad5d---71719636781.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/2476fb4086c24162eb27d74783641af8/34893480090.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/161099dd34937d---biwufadidosamusekev.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/39af4fa42454fc781a1f48a192189d1f/79660676833.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/nowalotajagujavafoloma.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/80551961618.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10194 17596 bytes
SHA-256: 93b514b35e179da67ac47cd5375de7ed3e564b397fa3f2e3d61ad337e91489e3
font_01_sfnt_off00012eca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ECA 10768 bytes
SHA-256: 155457a33f83c8b7292a1918cebd024368962bbd85445b2dcd099cd7b2fe5309
font_02_sfnt_off000147c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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