Malicious PDF — malware analysis report

Static analysis result for SHA-256 af512a78d172c98b…

MALICIOUS

PDF

86.7 KB Created: 2021-08-14 15:38:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3e1f9cc5b2317f7caf23a3ba893a445e SHA-1: db6a42927b677f4f2264852d2fe19389130bfcf0 SHA-256: af512a78d172c98b55459e71f384c70e240590460536b849dc0d65ceb7759e1a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, with heuristics indicating embedded JavaScript and a link farm pointing to compromised WordPress uploads and disposable hosting. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF, likely to redirect the user to one of the numerous external URLs found in the document. These URLs are designed to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://mylodge-naoshima.com/28219933020.pdf In PDF document text
    • http://gute-reise.ru/i/files/files/dupogol.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/45302266967.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3fa15e073---rijatoruvuzivege.pdfIn PDF document text
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/15470051395.pdfIn PDF document text
    • http://rafaelokazakov.com/file/dunerasotepapibap.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/83013810003.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/63f1ffe9b33ad0da932f6e7b2f9439ee/belozowuwosemefirolisiden.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/buxoxorezotodugozapuvud.pdfIn PDF document text
    • https://baptistfriends.org/media/31578494665.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/javeletimilewabodi.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/75644022196.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/efeca43553df2150227b10f7d6766d58/fajakemedek.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/tesexemosa.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/1457452967.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/712ed63e1c5b64d06c00d504b70b92f5/26479945116.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/3dppslvdcbo42jmtk48t30nhj2/6257175806.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/0615f95d7404f962d30f9080e549e374/fupojow.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/kapiwe.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160903686ccf64---80203113770.pdfIn PDF document text
    • http://vietkinggroup.com/uploads/userfiles/file/saxotubusinatajize.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/dnvcgidsfl6blv4qvq9p9qoe50/noletarisalof.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/lomimezepi.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/dolefiz.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/57040768705.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=como+convertir+km%2Fh+a+millas+por+horaPDF 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_off0000ead2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD2 18292 bytes
SHA-256: c6071b85238e67d93e1a1659173b5e45c86402bfed2b47b3082712327718fb44
font_01_sfnt_off000119d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131E8 10860 bytes
SHA-256: 7ca3c9a21226b7472f21db27e0d82965a966e7e832e5ec72404ce6025d92a43a