Malicious PDF — malware analysis report

Static analysis result for SHA-256 19f7318c24302d3f…

MALICIOUS

PDF

78.0 KB Created: 2021-09-05 06:12:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d9c05b392388cc458756cac8dcc3a44f SHA-1: d8d6dfb794953cd4c90c291ee369fb255421e947 SHA-256: 19f7318c24302d3fb5a26348d5a74894b105a23de23f252d5853f484bef857b7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to distribute malicious content or phish users. The presence of external URIs and a high ML classifier score further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1606f91f956839---fowurafage.pdf In PDF document text
    • https://louvre.lv/res/wysiwyg/file/61479643249.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607632ceb5494---fuzutiwufojaba.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/5d295213b43a39528ca7dbc9e42daa5a/kodezovozutekoxujozug.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/fatovimizizopodunurarukam.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16093b3206c3cc---75450987890.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/vepedumepupugo.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/62157644794.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/zezit.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/fuwidoxa.pdfIn PDF document text
    • http://cy2hand.com/userfiles/55648972927.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/80530007596.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/bg2a4o1fp8kc73kn3rskanpo2t/lirimimugatapofivekese.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/nibag.pdfIn PDF document text
    • http://omni-links.com/images/blog//file/surerudusedilakas.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/rekinomawivaloxar.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/gasugoganu.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/82720191664.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/82070024646.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/99170475013.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210626_100819.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/4fab9b073bd42fd72dd0bda9a240a7a5/88903525466.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=graphing+using+x+and+y+intercept+method+worksheetPDF link annotation
    • http://www.geograph.org.ukIn 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_off0000ca8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA8D 17448 bytes
SHA-256: 27c893b315bbdf8fea8409c0d47a4417474c73f3d952507837555706d0e520cf
font_01_sfnt_off0000f738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF738 11448 bytes
SHA-256: 92fb60984f2a337e45143b03bbc2a13e143c37ad318041571dff71e96175e49d
font_02_sfnt_off0001120b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1120B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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