Malicious PDF — malware analysis report

Static analysis result for SHA-256 658e79c44063fc36…

MALICIOUS

PDF

70.5 KB Created: 2021-09-29 09:37:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 420ac028cb62140a5dcc6a1edf479d5e SHA-1: 373ef7256bb6533d048a989ffea1334990831eef SHA-256: 658e79c44063fc36ef1a6fd09a4b25ae77d3179a6e1dfe9b0ddab6c13a38547d
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://nujhimachal.in/img/uploads/files/sufipov.pdf In PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16153f036a251a---14561228360.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/161436940a6164---sagorodo.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/1e1c239de0ebdab87dd1468655b4598a/pupenafimulivitilobuluku.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/55142681308.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/16232036391.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/ce3c28e6fe1ec090d744ecf00504713e/55388008575.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/3a1e6cdb003b0094565066adfa20f2d5/papogukuferaferib.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161475308ced29---vewubilapiviwas.pdfIn PDF document text
    • http://xn--80aguejfegacgj0ad.xn--p1ai/pict/file/gomewugelutufomeledi.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/c981534af8erj8s87s9sjt4b64/wakovirofebaruxakugat.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614ef1123af14---78138092446.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615381af39198---24297431714.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/38845376634.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/57d8cca7c1cddbedf0bac8bb24c2840f/lopanurukejoxatoge.pdfIn PDF document text
    • http://precisionsurgicalworks.com/alpha/ckfinder/userfiles/files/wiwerapipusiza.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///52866887635.pdfIn PDF document text
    • http://bookblog.kr/data/file/files/nukodizodogodekigegozubot.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/73635765663.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/zozurura.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/vupuratapuzubagikogum.pdfIn PDF document text
    • http://harmonie-avion.fr/actualite/files/56076511510.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16153e40d55f3a---zoxuxukugetevexik.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/f431cfd68ce8498a5fa48c84673c682a/54686784974.pdfIn PDF document text
    • https://seltec.io/images/uploads/files/tosepisopotoxabu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=best+offline+games+of+2021PDF 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_off0000b351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB351 15816 bytes
SHA-256: c96c5122727b4bfbee98d4ad0ea875f5e87e41fc412d21ec4802dec161010781
font_01_sfnt_off0000db5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5A 10804 bytes
SHA-256: 8807b3959dd05ad9b08e94d9523966dc1fd8c55d427af49aae5434f8d8c81c0d
font_02_sfnt_off0000f463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF463 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1