Malicious PDF — malware analysis report

Static analysis result for SHA-256 621ae13d03b2443a…

MALICIOUS

PDF

90.9 KB Created: 2021-09-18 13:20:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b726cce735e39b5045c627f5016afd82 SHA-1: 94c2824a8718666c363092a4cbf94c1f74093b5c SHA-256: 621ae13d03b2443a12655c6e5c10c7fddb9a18a29091ef412b425c5a1334ed24
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to potentially compromised or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and a link farm on disposable hosting points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://domki-kopalino.pl/pliki/zinonadesaleretorul.pdf In PDF document text
    • http://prime-standard.com/piceditor/file/dirizexolorigukudenam.pdfIn PDF document text
    • http://quanhoangtsi.com/upload/quangtri/files/faxiluguxunilavomij.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/35830312274.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/sevusamisijovajuf.pdfIn PDF document text
    • http://pate4me.com/userfiles/file/61514727445.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/96648845316.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/91221674437.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/85167930837.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161375f5132ab8---45323098458.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16137083e3d5b5---27108854034.pdfIn PDF document text
    • https://euro-m.si/web/dokumenti/file/kadodibofonewu.pdfIn PDF document text
    • https://telorgabus.com/contents/files/zigan.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/24271147359.pdfIn PDF document text
    • https://eol.org.pe/ckfinder/userfiles/files/kimosanilomiwemumeno.pdfIn PDF document text
    • http://kaus21.com/userData/board/file/95918374319.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e736f43eca---5114830029.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/rro5s4d8r951dm4tmgj8o7el41/96010118844.pdfIn PDF document text
    • https://kstraders.com/userfiles/file/muwozibunuturaw.pdfIn PDF document text
    • http://apex-architect.ru/images/file/56689703513.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210902034619.pdfIn PDF document text
    • http://avon-bratislava.com/files/files/99239792872.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc3732fdfb---63468681783.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=google+i+o+2010PDF 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_off0000ff39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001174f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1174F 9984 bytes
SHA-256: 0eafe69dea44ec2a45a2c9000df6109952048e32e181f2a62f4163e293d02a30
font_02_sfnt_off00012d91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D91 18060 bytes
SHA-256: 9bacfd9196a6491e37529df79bd90b85fbe7ab527d51e5f60b0316c2d69c166b

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