Malicious PDF — malware analysis report

Static analysis result for SHA-256 170eacac5476ddc4…

MALICIOUS

PDF

70.6 KB Created: 2021-10-02 22:05:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0955f640071fc459bbc28f88c6dfb380 SHA-1: 731dc960cc23ae3ffc0ed89cd89cd75d0bf1ce5e SHA-256: 170eacac5476ddc4e2c8f3e1e0a1be6f46f07875f75265d590eef353ddda7ac9
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, redirecting users to multiple compromised WordPress upload storage locations and disposable hosting sites. The embedded URLs suggest a phishing or malware distribution scheme, likely involving a second-stage download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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 https://laborke.ru/uplcv?utm_term=showing+empathy+towards+and+with+others PDF link annotation
    • http://sksound.com/userfiles/file/wepotetevigekukizoti.pdfIn PDF document text
    • https://stvorki.ru/files/file/73745548839.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/d642a11990ff2f9efa287cd969facd33/dojuzomitujonodof.pdfIn PDF document text
    • http://ipcmanpower.com/admin/style/images/userfiles/file/54710776107.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/sefusaguka.pdfIn PDF document text
    • http://metallpress.info/files/65478772014.pdfIn PDF document text
    • http://splogservice.ru/content/files/jaxasutosalajewulig.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/7902815323.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/zebizivexikilefiwudo.pdfIn PDF document text
    • http://519pf.com/userfiles/files/wujofafek.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/sikajaxuxiwenoterobejajas.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16156d9f4c59b3---kasozawew.pdfIn PDF document text
    • http://mp-journal.com/media/file/5253654525.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/zefuzatituvonukujo.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/muxefimojovepo.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/40664857412.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/b6b23cfe97f183acc85825ff6a208768/12262808255.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021091213050273499.pdfIn PDF document text
    • https://gaadalagi.com/contents/files/90029763688.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161362bdcb9c3d---worix.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/6430996928.pdfIn PDF document text
    • http://kht.civilkozpont.hu/uploads/file/61542916249.pdfIn PDF document text
    • https://wrd13.com/force/file/mafanenexa.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16155f0a0c4dc8---18050111262.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://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_off0000b468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB468 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC7F 11068 bytes
SHA-256: 0e1ee3a475320d56337c049a7c06c05eec6ca89065976a1331f002b3a1c33a12
font_02_sfnt_off0000e5fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FD 17256 bytes
SHA-256: 1b0bb02c3f69f672ba1da62b2d704a5bec26ee6fd4603e10d514a3bd51f52031