Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b92feadd6b014e6…

MALICIOUS

PDF

82.9 KB Created: 2021-09-05 10:22:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7180cc3cfb30c05143dc4827d444a457 SHA-1: 658a552d1267e94e503f6d9874ba65feb3830f3a SHA-256: 5b92feadd6b014e61958b17717f0909f132d88b6f5336e6a3bd2455dd7c5e5a1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it contains embedded JavaScript and a link farm pointing to compromised WordPress upload storage. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to redirect the user or download additional payloads. The numerous external links, many hosted on potentially compromised or disposable domains, reinforce the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.hinkler.com.au/application/third_party/ckfinder/userfiles/files/niwodejeruwotefak.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/df366a0920e42babed51a154045c6b75/polufujimuwoven.pdf
    • http://cornucopiafrederick.com/uploads/files/marixodutosup.pdf
    • http://hnsunnyfood.com/d/files/tetozavivepimipom.pdf
    • https://skiclubraonbaccarat.fr/pdf/kenivibabi.pdf
    • http://hzdsbg.com/uploadfile/1624004005.pdf
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/78f2dd1c7cca16b1afe63094a0e7d038/birugigij.pdf
    • https://spa-salon.ru/ckfinder/userfiles/files/65846064049.pdf
    • http://studiomanzetti.it/userfiles/files/dunosivolewavovo.pdf
    • http://captaincook.hu/userfiles/file/89123459989.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5c25191d1---45952964172.pdf
    • http://lexus-custom.com/js/upload/files/55198189911.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/b594949962845e28da62922fb535d9d5/bagoretawusefigesase.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/966a6147621af8dd017521fa7d167ef3/10670036566.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608118a13ccff---70590268483.pdf
    • http://brette-animation.com/userfiles/file/filokajusudisudimopog.pdf
    • http://rybczewice.pl/userfiles/file/12237291531.pdf
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/jewifo.pdf
    • http://www.hermosabeachbungalows.com/userfiles/files/525265455.pdf
    • https://micro-logic.ro/images/uploaded/file/mumumawaxim.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076445c39a56---mejakeve.pdf
    • http://martonaroniskola.net/userfiles/file/24587671818.pdf
    • http://esistore.be/userfiles/file/92588462882.pdf
    • http://showplus.ae/userfiles/files/buwizaxab.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=aeon+timeline+2+manual
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e111.bin
575298204e0e342cec83d6624208b5931b9562f711c9ce7be26f818930d25936
pdf-font-stream PDF embedded font (sfnt) at offset 0xE111 18196 bytes
font_01_sfnt_off00010f84.bin
27b15bfaad82f34bd3fcea16308faa95ceecd4a6d6a9c4fb00fdde812d56e090
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F84 10200 bytes
font_02_sfnt_off00012672.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12672 16792 bytes