Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1dda9345d604aab…

MALICIOUS

PDF

79.9 KB Created: 2021-09-03 02:50:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2e6ae84838ae31af80c62eef68cefd96 SHA-1: 65fa04cd4ed6c7266c2fcc0ef7b5a095473b0f29 SHA-256: e1dda9345d604aabd4351703f8f19115d8167bbfd54663a1124005f350bc53ab
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to lure users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics and the overall structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/e8587db3ac1b1977ef87eaebd39c99d5/65785712335.pdf In PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/d1a72934c11d2f1eff6463775c99f15b/7588918039.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210725074454.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/sekofofifid.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/i3udm6ot4ot4lveh7j8rv1ej37/6953733466.pdfIn PDF document text
    • http://majedalkarkhi.com/pics/file/34204950461.pdfIn PDF document text
    • http://bluebossa.pl/files/file/jokofosemewopo.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/13515507298.pdfIn PDF document text
    • http://oshcongregation.com/userfiles/file/giwuweboriteralegasono.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c87908170f---gavedoman.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7729ff02e4---xidafizatuz.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/16850804674.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/10552409490.pdfIn PDF document text
    • https://kopari.hu/files/file/radozuwo.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/30225475259.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/wijotakufavedifulog.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/r3uoqnp3hvlkf1l86s35sbd646/86691358468.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/suxesemuj.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2808ecdc1---mabedurebapatezifedif.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/83iik1ihjeuvne8u5rf1t4pc8v/narerediwalamaxeror.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb6f852406---mokeniw.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/28057533258.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/ndhia0i0up5m6m0tr1a2n3vl48/68999182852.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/h1qp1rilfppl8dnfue40p76qog/jasabaduguxuwaje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=la+cigale+et+la+fourmi+histoire+pdfPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ad0c5cf5a---60271197394.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_off0000ce07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE07 11020 bytes
SHA-256: 3e84d6e43fac9bc1cbe2a76c351162ea53df54ca0aada954458e003bb525c8d9
font_01_sfnt_off0000e77a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77A 19480 bytes
SHA-256: 2745861ffb14c15ac2854ac557d45ea35e62b8fda0576d9aedf54a9af2d3b1e9
font_02_sfnt_off00011859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11859 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1