Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a22c0ef44658dd7…

MALICIOUS

PDF

77.3 KB Created: 2021-09-20 08:29:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 78922ee9ba84b5fc638a26ea76935369 SHA-1: f4fa03dd36bbe66c90623efc981ceb202c5c7210 SHA-256: 5a22c0ef44658dd7c904c0d742d130324897d0d7dfa74001ffa86d30e6700744
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of JavaScript indicates an attempt to execute code, likely to redirect the user to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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
  • 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=reason+for+download+pending+in+play+store PDF link annotation
    • http://szpitalstrzelin.pl/userfiles/files/kixafudamo.pdfIn PDF document text
    • https://jagamimpi.net/contents/files/57842338247.pdfIn PDF document text
    • http://youngdongtec.com/userfiles/file/vunaxedu.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/32419394317.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613215fbe9887---56735792512.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/12650208782.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/9681729317.pdfIn PDF document text
    • https://contemporaryteas.in/admin/uploads/file/sipore.pdfIn PDF document text
    • http://expnavi.com/sites/all/sites/default/files/file/94137668968.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/40290574344.pdfIn PDF document text
    • http://adimhukuk.com/resimler/files/zaluse.pdfIn PDF document text
    • http://ucokampen.com/media/files/32765162056.pdfIn PDF document text
    • http://connect-event.fr/ckfinder/userfiles/files/wizinimolijobekoridifumub.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f837c995e3---jekuwozomeniwoziruki.pdfIn PDF document text
    • http://susasoft.com/upload/userfiles/files/12891689788.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/38470445731.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/21301951252.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/52494435442.pdfIn PDF document text
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/boluvu.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/161470f70a45d2---91873843904.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/83780189165.pdfIn PDF document text
    • http://xn----7sbjvweekof5d.xn--p1ai/files/files/saxewalolalebetuxisupur.pdfIn PDF document text
    • http://syntrend.critical.tw/upload/files/bopokukeli.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/84005538965.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/67545824051.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE428 10920 bytes
SHA-256: 4a774f8ec07fd76df3f9f3951a91e2dd0eb5b90e0d14426fabec531764ce1b16
font_02_sfnt_off0000fd67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD67 16412 bytes
SHA-256: d4b7e1386ebcf925c482ec3ac32e5a89ee7241e93e7ffe5f13d4250235ce5413

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