Malicious PDF — malware analysis report

Static analysis result for SHA-256 a58999064a72e627…

MALICIOUS

PDF

80.1 KB Created: 2021-09-22 09:33:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3ebeb1054c6d367f79fda245cda6e30e SHA-1: 825b01e58b232ec43b4ca1cfb5a02ccc39c15e29 SHA-256: a58999064a72e6273c32f59e23ac950e144ca817e7c868494453b85c9beb4a52
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Static analysis revealed it functions as a link farm, with numerous embedded URLs pointing to various websites. Several of these URLs are hosted on compromised CMS upload directories, indicating a potential distribution point for malicious content or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://cpsguffanti.com/uploads/file/bireziga.pdf In PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/wovizerowabux.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/gozezekowikosebusir.pdfIn PDF document text
    • https://tradegateindia.com/userfiles/file/vumugatudisisu.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/2296176199.pdfIn PDF document text
    • http://medtravel.pro/images/hand_uploaded/files/96795654334.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/ditigibiwesinivomosujufiz.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/gadiwevifudewitise.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/judixed.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16134335b28f65---moniniloxukurakedim.pdfIn PDF document text
    • http://gndpta.eu/news_objects/files/1455986063.pdfIn PDF document text
    • http://sensi-leszno.pl/userfiles/file/98204459303.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613076ddcb6b4---jokezobupoberoma.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/90368502923.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/36992528721.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/90682555109.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/84930187271.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/tosodoburexinawikugi.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210901_E6829783A0C75180.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/97408060626.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/a3f17ed254ac2fdea82d50e4a691561a/womasejaweletanuw.pdfIn PDF document text
    • http://tradeweb.es/userfiles/file/nijamor.pdfIn PDF document text
    • http://dunakeszi.varosom.hu/userfiles/files/4072275117.pdfIn PDF document text
    • https://cet.sk/res/file/27119490569.pdfIn PDF document text
    • http://mlead.net/images/e/file/88296511040.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+retrieve+phone+messages+on+androidPDF 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_off0000d712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD712 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF24 16228 bytes
SHA-256: f0d54721f8e97cecf9de65cddb5de856cad695d69524380ed17f876fdf1bf383
font_02_sfnt_off0001192c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1192C 10936 bytes
SHA-256: 4290dec8374bb64afb2250761f6716a24c9c2c3bfc26db578032bf1fdac66972