Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1631f6037b078d9…

MALICIOUS

PDF

88.9 KB Created: 2021-09-14 00:32:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ecdf1ae9030eca9b2fd04f2740992542 SHA-1: 18e097a7bfc0360d269aa0032903aea6529f8454 SHA-256: a1631f6037b078d91bfa27e3a89631533acff70d7f8a993e34cec13abe2dad9a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://synerhu.ru/uplcv?utm_term=flight+status+app+android PDF link annotation
    • http://kaizousha.com/js/upload/files/gatoxetex.pdfIn PDF document text
    • http://sabancilojistik.com/userfiles/file/guxowoda.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/sojukozo.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/43429366d4225df2580385b4106c3560/95918601055.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/a8cc49f7ec272cd8d1c8a866f6451edf/xajazidamasawebez.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210905_091156.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/pifokagafis.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/puwuj.pdfIn PDF document text
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/76770127786.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/64297857415.pdfIn PDF document text
    • http://stilistspb.online/public/files/uploads/files/wopejisesodoxotivixogetal.pdfIn PDF document text
    • http://www.ctmmaximoravenna.com/ckfinder/userfiles/files/zufivokenerime.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/wezina.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/29192887495.pdfIn PDF document text
    • https://elmawadah.com/userfiles/file/jerebunasu.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/wunek.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9ba78ee49---totaxoteregufetojisip.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161316c2a71f2c---notafozulutufo.pdfIn PDF document text
    • http://5thaveseniors.org/userfiles/file/posafujajukidokogemuk.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/5fagq45uki3ruvisn49kn8gr2p/kolipatilebitotusuzivezi.pdfIn PDF document text
    • https://kvzriu.org/images/file/funuvonavigodemamaf.pdfIn PDF document text
    • https://emenu.hu/editor_up/89709229852.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/16218105899.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/dubagesodan.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_off0000f7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FB 10616 bytes
SHA-256: 3a257c1ab2059087e3ba2beb6dde84b916d01db086030486e2331efdb504e897
font_01_sfnt_off00010fe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE6 17780 bytes
SHA-256: 85018b634c2443aea3a0ae4db9b650d8da7f3be7223d4c0153721d1849601a2c
font_02_sfnt_off00013dce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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