Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf3b9d729fa2c1bd…

MALICIOUS

PDF

82.4 KB Created: 2021-09-17 08:51:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9062471a13ae8fc30c741fd0fb6e4057 SHA-1: 1e7495cfa18c6a24e5af580d3d1bc21f66b0b2d2 SHA-256: bf3b9d729fa2c1bd34ab1243c62856f924cd560adb1b412228df917c766737ac
164 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised websites or disposable hosting, and includes a visual download button lure. The presence of these elements strongly suggests an attempt to trick the user into downloading a secondary malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://smidgel.ru/uplcv?utm_term=download+fifa+16+offline PDF link annotation
    • https://ciela13.leaddeehub.com/userfiles/files/19879044532.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/d7d98da4f1dcd724cdcd1361dd0edeb9/wolotujutisoka.pdfIn PDF document text
    • http://foreverymuslim.net/home1/forevev3/public_html/foreverymuslim/upload/file/94927223738.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1614235177c395---46529852221.pdfIn PDF document text
    • http://azstorestudio.com/uploads/files/86877134630.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210904_172359.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/lavitidexewoligobumitaw.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/vofokegivirem.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/52416483945.pdfIn PDF document text
    • http://flexa.cz/docs/file/83517454126.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/kivifenef.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16134c84e2315b---zemowufukowirera.pdfIn PDF document text
    • http://kdbelektrotechniek.nl/uploads/file/gidupanubawiregavubi.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/84878551392.pdfIn PDF document text
    • http://xnucleus.com/members/member_images/files/942936489.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/kenub.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/kopowu.pdfIn PDF document text
    • http://dxline.eu/userfiles/file/63594249815.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/gedegejuj.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/12684084568.pdfIn PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/sikupu.pdfIn PDF document text
    • https://eniedu.com/data/file/20210912205205.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_off0000dcac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C3 10288 bytes
SHA-256: 6ae17246de63d4dc3660be006f64bb0ca8545a03190b30fe39a76c7e4d5f8fd2
font_02_sfnt_off00010c20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C20 18700 bytes
SHA-256: c819bfca72e4ffc9bc1ae955ab326c47d6295935453745bc51e8fdd3dd848965