Malicious PDF — malware analysis report

Static analysis result for SHA-256 a703fdeab7a97658…

MALICIOUS

PDF

84.0 KB Created: 2021-09-16 15:13:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 953edb977f7f9d956969695e85b51430 SHA-1: d2118cb3a31ae5bde865c5bcc3801cbc1c29635a SHA-256: a703fdeab7a97658c3a7f4805a7e43f375ee59c1c1bf1bf8cfffe0c5a067c3d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload storage, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL analysis are sufficient to infer the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://mopron.ru/upload/files/52203836002.pdf In PDF document text
    • http://unixsensor.com/uploads/files/202109011017411375.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/rurovigo.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/zoxofokexikaga.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/12936350775.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/36749452191.pdfIn PDF document text
    • http://grandioso.asia/editor_upload_image/file/pojudusise.pdfIn PDF document text
    • https://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/pepexizut.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/gujejamumujeregejazub.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/86054763879.pdfIn PDF document text
    • https://pecintajp.com/contents/files/zujivujepezal.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394c7cdc3fc---rawovagifedem.pdfIn PDF document text
    • https://flavio-tonon.it/public/file/62545830050.pdfIn PDF document text
    • http://qualityfirstservices.pro/testingsites/advantage_aviation/assets/media/file/guwuforazutegabi.pdfIn PDF document text
    • http://sensor4you.com/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/xisotejoxuwoxopimep.pdfIn PDF document text
    • https://peisheng.org/uploads/ckfiles/files/612eca75b9006.pdfIn PDF document text
    • http://p-jtech.com/userData/board/file/85584393437.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/k6b25ck596oisdpje34mvrddv4/fixabemorekame.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/medaxabusujagavawinulaz.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/0e5c8ecc9794bea0817ea9b98a4c8f6a/wezewezedazare.pdfIn PDF document text
    • http://anadolumatbaa42.com/genelresimler/file/borumavemotabajasijaj.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/zazulanudipemebe.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/52074898485.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=media+projection+apiPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d82b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82B 10416 bytes
SHA-256: 18240825d199ca6069574c414d7d3f0d493ba38d1701e742403bd50ab6981264
font_01_sfnt_off0000efd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD3 18240 bytes
SHA-256: 73e4685945dbc2820e8a9a65816b415c9865d3f82d0e61cbc4ee3c89c7dfd11b
font_02_sfnt_off00011f5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5A 2308 bytes
SHA-256: c76b23a9c2ad4b356f637e28728f9db85625a9d7f93d317f921474dcd757067f
font_03_sfnt_off000129aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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