Malicious PDF — malware analysis report

Static analysis result for SHA-256 de28d633fab08891…

MALICIOUS

PDF

83.9 KB Created: 2021-09-17 21:59:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6398a5a2356ffba7f58f9e4f2812706e SHA-1: 4f18fbafd28641a2c231ba68f0ef2e4eeebc7d14 SHA-256: de28d633fab0889138ecb4ef7347fe28ec982fdb3238a89c2d15a9a131dce8f8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of 'LOLBin token sequence in document text' further supports the malicious nature, likely related to command execution or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://irlanc.ru/uplcv?utm_term=neymar+is+a+soccer+player+what+about+you PDF link annotation
    • http://phukhoabacninh.com/images/files/34652583045.pdfIn PDF document text
    • https://tainandentist.com/uploads/files/202109081715299952.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/35217117300.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/ff604524d281ff162ec38e9added106a/damepinidagapuzadilomod.pdfIn PDF document text
    • https://yaofangpeixun.com/upload/files/budoxevabuseralimojola.pdfIn PDF document text
    • https://www.tamilsaga.com/ckfinder/userfiles/files/89839177576.pdfIn PDF document text
    • http://goldsunjsc.com/upload/files/96557978648.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/8267482101.pdfIn PDF document text
    • https://granitnet.hu/editor_up/41804284237.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/towig.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/korukug.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/88747136754.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/93141327917.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/zupuxizogirofiwefatewus.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/33037701552.pdfIn macro / runtime command snippet
    • https://jbdclothiers.net/emailer/userfiles/file/43988169907.pdfIn macro / runtime command snippet
    • http://maternites-catholiques.org/ressource/site-image/files/94088432679.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138eaa5a4d57---dojozesinibaja.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/41393568567.pdfIn PDF document text
    • https://arabadvertise.com/userfiles/files/60189675593.pdfIn PDF document text
    • https://photojet.net/userfiles/file/pakemiberuxonazi.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/vuxiwozalivilamowanevu.pdfIn PDF document text
    • https://bczenekar.hu/files/file/tadizokevad.pdfIn PDF document text
    • https://southernwashpros.com/nbloom/fckuploads/file/petasosojofanivosira.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/161405c8bbdab0---pekikowutemosunew.pdfIn PDF document text
    • http://abwnickersonplazIn macro / runtime command snippet
    • 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_off0000df28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f73f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73F 10952 bytes
SHA-256: 33c920861025717bd5b09da466da75896e726822cd6f923ea10deef38d78ad5c
font_02_sfnt_off00011082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11082 18468 bytes
SHA-256: d09675a68a0420e04ea788efc722926d74c688357719ccc7170020e27d0102d7

Open this report in the interactive analyzer, or submit your own file for analysis.