Malicious PDF — malware analysis report

Static analysis result for SHA-256 671e5776bec6eff5…

MALICIOUS

PDF

82.4 KB Created: 2021-09-17 13:18:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8ec2b5a2f18a83e33f6886f7c2969ec6 SHA-1: 2ebc31438b6193e744f91fc415caa76c5f9cb858 SHA-256: 671e5776bec6eff5ddaf1bacafa3eaa547045b885102b3d8c6a24ed7dafe0986
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were directly extracted, the PDF structure and embedded URLs point towards an attack pattern involving user redirection to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://pistant.ru/uplcv?utm_term=iphone+video+call PDF link annotation
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/161445d7ea2393---powoxozemamasozakavesew.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/f7ab849457e3b4f1cac1d5f96a9daf64/pezexazusekilanip.pdfIn PDF document text
    • http://artc-polymers.com/upload/images/files/48916152281.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210908042819.pdfIn PDF document text
    • https://cezartravel.hu/userfiles/file/86083140242.pdfIn PDF document text
    • https://pleasanton.com/wysiwygfiles/file/13195662931.pdfIn PDF document text
    • http://sintniklaas.kinderopvangpimpeloentje.be/ckfinder/userfiles/files/xonizubuxobepababawaxi.pdfIn PDF document text
    • https://robodom.si/files_vsebine/mutexeremumivirinif.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202109081101233904.pdfIn PDF document text
    • http://tugrabilgisayar.net/resimler/files/somituj.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/nitukivotodosawop.pdfIn PDF document text
    • http://tulga.ru/editor/files/96451503083.pdfIn PDF document text
    • https://underworldgear.com/admin/images/fckImg/file/92393062761.pdfIn PDF document text
    • http://bftt.marketsearching.com/upload/files/dotoferiji.pdfIn PDF document text
    • http://coffee33.ru/archive/file/35433315390.pdfIn PDF document text
    • http://thepducphat.com/upload/files/mijotoposebenijaja.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/4737476049.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141eea7e44a4---reberozexelupepuwikuvivug.pdfIn PDF document text
    • http://aeusjtu.pretty-match.com/upload/files/21603961107.pdfIn PDF document text
    • http://oiseau-bleu-morzine.com/userfiles/file/tekinubagipomud.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/a9cahokt8ueoj1om8916v19cmo/tagukujekobawodu.pdfIn PDF document text
    • http://neoclassicalmansions.com/uplds/file/52761666775.pdfIn PDF document text
    • https://rm-parketi.si/uploads/37957758125.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/jewulegilimonilazel.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_off0000e017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE017 10264 bytes
SHA-256: ba4a965ddc4ca329e63b185c557e8e425dcc40822fb91aa3f9dd1bd361d5a50c
font_01_sfnt_off0000f705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF705 17544 bytes
SHA-256: 6212cdd32c44ec94f9785e6444728836165b51a4e2b78b637bdd8b7ac13b6853
font_02_sfnt_off00012479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12479 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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