Malicious PDF — malware analysis report

Static analysis result for SHA-256 d537fc320d21824e…

MALICIOUS

PDF

86.6 KB Created: 2021-09-23 02:09:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e114298fce9221d3b2dc2a79e703ebfa SHA-1: 24a50a5588f0ff72e6749c4341130308ccc1663c SHA-256: d537fc320d21824e7f40547d32301fe7e0fd09c9f44061fc2f92d0ffd67063c5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites hosted on potentially compromised or disposable domains. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL patterns suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://porfic.com/fotos/file/kisunus.pdf In PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/sasuxefunatakufajasemub.pdfIn PDF document text
    • https://turasmobilya.com/img/editor/image/file/duselizuwarur.pdfIn PDF document text
    • https://ihappywash.com/uploads/files/202109171318054915.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/kuwulovojifozasu.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/40230872127.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161457a56739ae---sobewowuri.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/luneb.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/0c3303efcbcc54067a37ad513a91b036/wesixogunedapixezagut.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/rutiduduremewufepiva.pdfIn PDF document text
    • https://inprovitvenezuela.com/ckfinder/userfiles/files/kupoveforovoru.pdfIn PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/9759546610.pdfIn PDF document text
    • http://www.sandipmallick.com/fckimages/file/18723841595.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/denefirefivazofofa.pdfIn PDF document text
    • https://griby.biz/ckfinder/userfiles/files/76510761812.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/ngnani7mqngbhs3bkcr8pnvmfp/14987534595.pdfIn PDF document text
    • https://n-tlg.com/files/file/7078778804.pdfIn PDF document text
    • http://vxclouds.com/userfiles/file/77764302802.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/bbf75e477f90cb5d512c0062ee0e75cf/88387976572.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/tajijuwamekibitamaburofox.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/fabininula.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/93176800474.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/dupafuzozigi.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/mabutiwubupijudomerizup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=happy+words+that+start+with+fPDF 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_off0000ec4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4E 10504 bytes
SHA-256: 935005ae014bf641706bd0a32d4015f29de3a84e2ab85743b02bd0070de97b0e
font_01_sfnt_off0001045a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045A 18692 bytes
SHA-256: a08db1b6bfda1a12b9923ef8898ec564073d564762686cbe05d5ddfd5e6e16f1
font_02_sfnt_off00013456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13456 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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