Malicious PDF — malware analysis report

Static analysis result for SHA-256 e43bea3c4c48debe…

MALICIOUS

PDF

72.5 KB Created: 2021-09-13 00:30:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4e005bf766a6747ad8ce627b140b22ae SHA-1: a91f25f18b0faf2ca2ddaa0158756a6179e343fb SHA-256: e43bea3c4c48debe5ca60ac183d4d29bbd49b7475bf78eefd110d525cccd9bef
176 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous heuristics fired, pointing to the embedding of external URIs, including one directly on an IP address and others hosted on compromised WordPress sites. The document body appears to be malformed or obfuscated, preventing a clear understanding of its direct content, but the embedded links strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://enslev-anlaegsservice.dk/userfiles/file/37156153126.pdf In PDF document text
    • https://dreptultau.hotnews.md/upload/userfiles/files/23225763774.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/faropokamorinedelufubaxos.pdfPDF link annotation
    • http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/95610347198.pdfIn PDF document text
    • http://www.extramas.com/userfiles/files/zizibefijiletibubema.pdfIn PDF document text
    • http://atya.eu/files/file/simojo.pdfIn PDF document text
    • https://doina.md/fckeditorfiles/file/jaboridivo.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16139dc570108f---dakigowilulifo.pdfIn PDF document text
    • https://poganyvolgyi.hu/userfiles/file/65899639194.pdfIn PDF document text
    • https://aljazeerahdrilling.com/userfiles/files/fejonirurigumitev.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139eb41818d2---wufolo.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/fevujodoxubozusafoxuzotud.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/sojunewaveno.pdfIn PDF document text
    • http://bubb.cn/up_file/file/23186482488.pdfIn PDF document text
    • https://granitabrasive.hu/editor_up/vogakut.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/28af53511d90ba956c9632d20f9905e0/7573033451.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/98839517671.pdfIn PDF document text
    • http://hacsbathtarntaran.org/~/userfiles/file/sivuwiwi.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/6r4inqm4t1f90hv3vj4f44mgb4/zixonutesugoxesoxod.pdfIn PDF document text
    • https://jocafoto.com/fotos/file/dokujofidakekelu.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/0554d37b7ad09fabf6ed11a52f48dc06/fafinoxedewepabinev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=mini+block+craft+new+crafting+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://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_off0000b62d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB62D 17024 bytes
SHA-256: ec87460dc87a4a4b0281f2cb73d71d0e2d4e86e988d080b2e12e529c032ae4f0
font_01_sfnt_off0000e16f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16F 10896 bytes
SHA-256: b2fbda7c080f8413b2f45ab32839003de49ca9a94ae004ce6583ddc27875b5a9
font_02_sfnt_off0000fae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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