Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b0a20d472b81b31…

MALICIOUS

PDF

81.8 KB Created: 2021-08-31 04:28:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 7a871037cb9c0c3d85cb06961405e906 SHA-1: 41c06d24b879c8c9c6acaea9480caca0cbdc20dd SHA-256: 5b0a20d472b81b3182dc560d6b41c1ed7911ded0aeaa1b1f4e3311d3b703691f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites. These links form a link farm, likely intended to redirect users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, with the embedded JavaScript potentially being used to facilitate the redirection or exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://ketchas.ru/uplcv?utm_term=multiplying+by+10s+100s+1000s PDF link annotation
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/8a637a572ec3d70d500c110e8efb0222/jupaj.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/70442482425.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/d478213e3f912283944445126b87da7a/voxokoxudubax.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8b3e86f23---xoxupofoxajim.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079eac2e98d4---70297364464.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af86921eba2---xirojopusibeduzatuk.pdfIn PDF document text
    • http://salespate.com/userfiles/file/93809154828.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f79c5fbe8a73de5ac6b1221c4acc6497/lilirafasapunawut.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/8d7b4e219020c79470314324077a8787/rujisidinukomugagaginele.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091ebac20287---58925000550.pdfIn PDF document text
    • https://ville-saintleonard.fr/pdf/wujemededapamuba.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/63393266673.pdfIn PDF document text
    • http://firegallery.ru/img/upload/disogutidovij.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/powenemefugoton.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/neduluwe.pdfIn PDF document text
    • http://factory-01.com/js/upload/files/36762519562.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/87077642179.pdfIn PDF document text
    • http://tuning-zone.eu/userfiles/file/9001263356.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/76688400473.pdfIn PDF document text
    • https://jurad.eu/files/file/romepa.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/90085248477.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210613224805705.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/bazuguwojof.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD991 18724 bytes
SHA-256: 053719c1a66257f49d7bc09fcbd1abd13d24f4d17a89d0bfad72e1b2effaa4e5
font_01_sfnt_off00010a3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12255 10432 bytes
SHA-256: b09bac052769cfbc7c2b93aa44289437f9217b926997f75cefe1cb90c9e6adb4

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