Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5b0e1fb26dd98fe…

MALICIOUS

PDF

75.5 KB Created: 2021-08-29 01:30:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 235fbe1a81c00dc8a15db7b3f2a56865 SHA-1: 17001082bce5657a6a31409f2fff2cdb20cbf123 SHA-256: b5b0e1fb26dd98febf17ed0edbe71cff0ac42f458fc4da49969f001023f79aa3
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to various domains, many of which appear to be compromised WordPress sites. The primary purpose seems to be directing users to potentially malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://gaestehaus-am-erlkoenig.de/img/editor/file/42460941527.pdf In PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160ddf100422c4---zibip.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/pelivefunisalegafunuku.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/siwivadilasizevufetamima.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/goponomojefiperodabe.pdfIn PDF document text
    • http://kistours.hu/userfiles/file/lopaxisufelej.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160945b18b0e0a---bokopasofezofur.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/ac0bf6157916c097e3d8d7c82586eeaf/63784103497.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/8745102528.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/jakarivo.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/9836321485.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/849535b58fef7706305b95d41bb6bf70/39418616748.pdfIn PDF document text
    • https://technische-dokumentation-hoffmann.com/upload/files/22803366530.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/nirida.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/80961957783.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a44777d2fd2---75969832350.pdfIn PDF document text
    • https://orangerun.re/photo/files/fafawekalevenizefibad.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edd75b61be6---fevaretewubexuju.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/72184126697.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/ruliwizokenizotugowun.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/7i8l916ls3rveoa3h2nu0cel11/30473484792.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/093a25c51d1fd07920babbb8e5009bb5/4969486478.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071bcc3c015f---xijegametenakonizi.pdfIn PDF document text
    • https://www.leasing.net.in/ckfinder/userfiles/files/98623408961.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/8bfb4815ea1e9564feb0b06bb5777963/pizum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=pokemon+omega+ruby+gba+downloadPDF 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_off0000c30d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC30D 10764 bytes
SHA-256: 61933b6d1297be4ec39c74570e9d150b75aa8610a2542176406983b6de5828ab
font_01_sfnt_off0000dbab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BD 16740 bytes
SHA-256: 9019ef11ebaa098bc7a00eaf1d36ec210e17e6cda95fc1aee90d4a8ad4e4343d