Malicious PDF — malware analysis report

Static analysis result for SHA-256 522e6766703859c8…

MALICIOUS

PDF

94.7 KB Created: 2021-08-23 15:03:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4f66ec8df3ad3cdb78b5a023f89545dc SHA-1: abce18d61e697e4fba4e9f8703bf0cd59a392a6f SHA-256: 522e6766703859c85fe95a411fe9dcd11cf4896e7f1a16f4c8b72b30e46db26f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to compromised websites, likely to host further malicious content or phishing lures. The presence of external URI heuristics and compromised CMS upload links strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/aee6211f192bbcc51fb291ccf3e39dc0/85782336426.pdf In PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/54b3021e3393ef1890fd166b1b9a273c/gidaxigitawi.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/momodenowo.pdfIn PDF document text
    • https://arerp.kr/data/file///12346216129.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/15215560866.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098397798c31---83422585212.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/2d8due0cgcrd5r285r89sfnj8i/83064073494.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df735d8c68---27909917709.pdfIn PDF document text
    • https://techlan.pl/files/file/92293286392.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a87dc02b1---wenivifeloro.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/17376420372.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/b9bd10c1b03d0abdadb47d9465813590/suxakada.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/72668305001.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076aa1d95464---4891190131.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/9047581037.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/fabirukinibevekipeki.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/1b1aca36152234ab309a5b7dbb261341/67457315182.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/31196946582.pdfIn PDF document text
    • https://lingchuanfloor.com/app/webroot/userfiles/files/wepevexogiganesibawijo.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/a24ab197c0f3d1cfd608ce98c4f1c3a6/befiwetogumesobawufex.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/dosodigunejumogida.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/531e69fb24faf1395df9d34b552a87d7/fijavu.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/dawilikux.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3383d528f---tajowifafirugat.pdfIn PDF document text
    • https://sanidom.pl/img/file/5559590092.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=nmap+discover+hosts+on+local+networkPDF 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_off00010fba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000127d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127D1 11000 bytes
SHA-256: 582279a87a2b9f3a32bcb669c1c7b57657d72a67a34655287c4b73a3cd2554e1
font_02_sfnt_off0001413e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1413E 16732 bytes
SHA-256: 726d19b07143f97a3df83526621ebcb8d1e1868db2b42fa939b7e84195319464