Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d06c3ee13b5b3f8…

MALICIOUS

PDF

80.4 KB Created: 2021-08-05 20:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f2f14d03a8354ae7780beb26e8b08f2f SHA-1: 4c09969d6bdfd286c80f343d9764e083e0b04703 SHA-256: 1d06c3ee13b5b3f80794874e51473858b24ec1cb194a54895c13810f1fb75aca
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely exploits PDF vulnerabilities or contains malicious content. The heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress sites and other domains hosting further PDFs, suggesting a phishing or malware distribution campaign. No scripts were extracted, but the presence of multiple external links and the nature of the heuristic firings strongly suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/85hshsl3ktqhit2i3mjuh3eeoq/29184576860.pdf In PDF document text
    • http://remobudostol.pl/pliki/vamusumiwimodeludi.pdfIn PDF document text
    • http://righetti1970.com/clients/872956/File/23900663274.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/m55keiufuil4k1enj0td5cq9ka/muruke.pdfIn PDF document text
    • http://dentali.cz/files/files/73052777090.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f230e152137---84641420801.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/90628348211.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/rurbffc79u2hpk2ibmi7iqhsa7/81750425837.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/50cfc1e6bd4e4062724a777e417866e7/79180318359.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a927bc8ed8c---sanesebapuwe.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082bd9035693---24760565930.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/bki9cpb0sc6oog4bqccq48gfq4/purum.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/3502219135.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/617c51f2e21a8c4fe7eb899208892efa/dagefagorabizabibe.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/6n1uqk5crf9f9m7b4gm4vaodp3/pudojamezidapef.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/71686582746.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/kijajadebelotaju.pdfIn PDF document text
    • https://watertorens.nluserfiles/file/jaserefuduxewaf.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/jubovarowupenobok.pdfIn PDF document text
    • http://shield-in.com/userfiles/files/83221949140.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/755b0c22af995c469e9cf6c8d9b16546/tosuko.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d37534a7706---sosofixupowudizuvi.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/82725604446.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7509a2d1b0---23624164068.pdfIn PDF document text
    • https://www.fortmcdIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=fort+mcdowell+bingo+calendar+october+2020PDF 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://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_off0000d8ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FF 10988 bytes
SHA-256: 5a1f1341db4ad291a815a535260d8aadd62a70f7e489db34c3be2e7588bebd49
font_01_sfnt_off0000f254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF254 17364 bytes
SHA-256: 5b5e5651f084fce698d77b400d1f3743cc543218eb9bdba1e830ad76c30f13f9
font_02_sfnt_off00011fdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1