Malicious PDF — malware analysis report

Static analysis result for SHA-256 9515991a7eb624a2…

MALICIOUS

PDF

82.0 KB Created: 2021-07-02 20:53:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: ef8610ed0a72d74e8d56913aecda24d9 SHA-1: b56ac6f5ac2ceaae9baf7471c4a5d269f9037f6a SHA-256: 9515991a7eb624a2f64fa49434ceedc639a93d05f78e2d8600bb44c2a58cc026
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was identified as malicious by a ML classifier and ClamAV, detecting it as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to other PDFs hosted on compromised or disposable domains. This suggests a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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.
  • 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.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/5i0chnlmcjkpbmpdutoucmsdjc/4590684113.pdf In PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/ul5v5ilssn737h84elfe9c3nf4/1767630064.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/8k2iku9rgb9jod3chq8jgr5dor/47607456891.pdfIn PDF document text
    • http://archiprojektai.lt/app/webroot/uploads/userfiles/files/jawanuvugakujajivepiz.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/jopizegikusiz.pdfIn PDF document text
    • http://ecole.ru/text/images/file/kosiz.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160962fabbc9be---kimamesagowafexarewotifof.pdfIn PDF document text
    • http://gibisch.org/files/files/migepixosiravijudi.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16081373f95506---zebiwarewuvi.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f070b0f83---dujaregonovumajozize.pdfIn PDF document text
    • http://jucal.es/images/file/ludujudumibudalekipuxof.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/42296436898.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/vonudowajavewiwuxij.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160c88974a9d69---47359886727.pdfIn PDF document text
    • http://goodwynva.com/clients/d/de/de91e19d235d8a3764238851c6b73f99/File/kazomerirolewominigolajej.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/9431f3010ea1081cd98f6c1908277311/wefumezuxison.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/b4c2d25fofuplco38v4kima6i9/futalokukosit.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/wemodoseweje.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/62407269977.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16082bd61a8491---31904269429.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/71024254644.pdfIn PDF document text
    • http://jhferry.com/data/fckeditor/file///vogamo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=news+analysis+examplesPDF 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_off0000e1a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A6 16084 bytes
SHA-256: f48920f37c8b7674467080250294a559311babbf2f1c4e3f829a8d11879b8188
font_01_sfnt_off00010b2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2C 10376 bytes
SHA-256: 8602606fe9610c3f0b6b712f421bbdb9a49704a5e2a4938442fba3ce0d966b3a
font_02_sfnt_off000122a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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