Malicious PDF — malware analysis report

Static analysis result for SHA-256 8544b8963580153a…

MALICIOUS

PDF

83.6 KB Created: 2021-09-20 03:14:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ec525b4279956941d011e26eecc7e41b SHA-1: 8aeb572f84b2e600d95927714409b16231670469 SHA-256: 8544b8963580153a3f4c64f37958e6a6044217ce617995e05fa7464c564c1fbf
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1555 Credentials from Password Stores

This PDF document is classified as malicious, exhibiting characteristics of a credential phishing lure. It employs tactics to trick users into approving MFA requests or providing one-time codes, consistent with techniques used to steal session tokens or bypass authentication. The document also functions as a link farm, directing users to various potentially compromised or disposable hosting sites, increasing the likelihood of payload delivery or further phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://bjsixiang.com/jingkelun/userfiles/files/20210908130209.pdf In PDF document text
    • http://intimatehotelpattaya.com/image/upload/File/dejudofelopu.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/bulesowis.pdfIn PDF document text
    • https://adikketiga.com/contents/files/30554991794.pdfIn PDF document text
    • http://giteduguedesboires.fr/userfiles/file/nekerimaniba.pdfIn PDF document text
    • http://www.mab-solutions.fr/upload/file/kavigajovak.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/fegutufaxezetawajazil.pdfIn PDF document text
    • http://potya.com/34933030763.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161436b6f33bd2---35533012737.pdfIn PDF document text
    • https://groupburuemas1.com/contents/files/53864358904.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/80395716646.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/laxakebanopidazubisupet.pdfIn PDF document text
    • http://uslugi-ogrodnicze.pl/pliki/File/19241200536.pdfIn PDF document text
    • https://jagominum.com/contents/files/lamixosenotelujilasitatov.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16139082aac689---95644267757.pdfIn PDF document text
    • https://bnovum.hu/downloads/87562578917.pdfIn PDF document text
    • http://hakanhurdacilik.com/userfiles/file/putagiluvepuxamigo.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/xipik.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210911082132.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7cd10035d---73866193895.pdfIn PDF document text
    • https://pharma-tools.pl/galeria/file/bureripupejipa.pdfIn PDF document text
    • http://lagrupacio.cat/file/9325487112.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=android+phone+gmail+accountPDF 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_off0000e02e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02E 10876 bytes
SHA-256: 69d036c17e05b902c78449e8c282cdb900673c2e2cf0e11ad5d3a534b0dbb95c
font_01_sfnt_off0000f8de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DE 18200 bytes
SHA-256: 29988d0c0a120d93966aa8c8d82be82a9d5b5049bae1c9868e0f87dc6311f2de
font_02_sfnt_off000128ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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