Malicious PDF — malware analysis report

Static analysis result for SHA-256 15202906e6cb36fc…

MALICIOUS

PDF

87.5 KB Created: 2021-09-13 16:18:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4c6250b45031d4ce8bce76c02e4f83fd SHA-1: 3b83006c94a63fff2eb484465ff111dd54389c98 SHA-256: 15202906e6cb36fcbff0985e973edf22eff510c4034c1a8869c1fe55275f94de
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 are hosted on compromised WordPress sites or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. The embedded JavaScript likely facilitates the redirection to these malicious sites.

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://ketchas.ru/uplcv?utm_term=the+walking+dead+10x18 PDF link annotation
    • http://hyundai-dongdo.vn/images/files/59280543400.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/ni19ei58amd89em5iiuk7mud6s/85147386444.pdfIn PDF document text
    • http://inteko-tula.ru/f/file/96092251836.pdfIn PDF document text
    • http://lovesenergy.com/file/27059405446.pdfIn PDF document text
    • https://zahrek.com/userfiles/file/kodazutu.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/wusililazigazarebobojexew.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/d1fba9503a460c7f2fdf77eadd8cf3b2/18659062380.pdfIn PDF document text
    • http://propack-th.com/image/upload/File/47359103293.pdfIn PDF document text
    • http://nifaelectronics.com/userfiles/file/47327841206.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/83538515235.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613092c598e37---xunuseruxozuzawefujam.pdfIn PDF document text
    • http://xn----7sbjvweekof5d.xn--p1ai/files/files/rawojosotijenovi.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/pmm4asjp26p0d2gr3opfia85dg/falat.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/a65a4583f6f445fe2cc7b46725b0b7df/zujejibitarol.pdfIn PDF document text
    • https://podgoricki-klub.me/userfiles/file/63832740850.pdfIn PDF document text
    • http://jingmingtai.com/filespath/files/20210905064345.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/23519386332.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/38304925966.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/63677994450.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/6415580524.pdfIn PDF document text
    • https://grootformaatspandoeken.nl/userfiles/file/wowifaloduziro.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/88027075147.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-2/20210902090050211808.pdfIn PDF document text
    • http://getdol.com/page_data/file/luzujenabodimin.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_off0000edf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10607 18764 bytes
SHA-256: 23abb65e44abf18b3289928e90dda3d189bc7290ff6d85688e88eec1fcca8591
font_02_sfnt_off00013674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13674 10664 bytes
SHA-256: 280a5364749d6e2b1a78e9f9447d4a68a1b49c1cabf73e3a96407dac196dcade

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