Malicious PDF — malware analysis report

Static analysis result for SHA-256 45bc27b37be76044…

MALICIOUS

PDF

89.2 KB Created: 2021-07-22 05:45:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b33933c99dd19a703c288a36484fb8fa SHA-1: d3a67c4d4b4998b3f74bce7916d638163029037d SHA-256: 45bc27b37be760440bc5ac16223e2885925a9c503da3b4a9eb2df5172a47b8ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or conduct phishing attacks. The presence of multiple distinct hosts and a link farm structure indicates a deliberate effort to obscure the ultimate destination and potentially evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/eedd259f047c42e377b92b6fa04adeca/zufubot.pdf In PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/45b0903f9c605c157bd73f66b8eaeea8/xenos.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/ee0d979d6ec2b6f8d9990b084bc48251/23237623192.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/0533bdab079a8da75b2b9fa7f54cf595/33015775079.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/minakanupar.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/5aed51ef38a9f36014b8b20928aecd80/1598000757.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/fufogabivemaragobuzo.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///71194736757.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/tinosemi.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/2afaltibenbtc3ajl2tna2kflf/budaxaz.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/27457174497.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/sawodisanilejijew.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7acb0fd7a---33235975444.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160e4cc7b94773---82847879204.pdfIn PDF document text
    • https://hansenlight.com/UploadFile/files/kaxilekekadewekak.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b906e05381f---21019209965.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/27469164894.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/fisusabigomaditukite.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/tizonedoxadufi.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b57f5a39acf---52298658405.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/pulatefikuranokofurev.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607093c98a65d---zotosizamukimimufapes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=air+exhaled+from+lungsPDF 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_off0000fd37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001154e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1154E 10888 bytes
SHA-256: 82a1e747ec1b13e2c14e407e6d95b2aa1945855a6d6a2396a8fc5bba528b5295
font_02_sfnt_off00012e09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E09 15844 bytes
SHA-256: 1bcb22ef54b53b5700bdf374056d7e1579fe2aa4ebf21e68f145aa8a38e95ec3

Open this report in the interactive analyzer, or submit your own file for analysis.