Malicious PDF — malware analysis report

Static analysis result for SHA-256 27ae64fd17f8277d…

MALICIOUS

PDF

95.4 KB Created: 2021-09-04 01:34:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: d0eb875214d7fbd70f0794c8b7cdfc1b SHA-1: c0d14cd7f1f96aff21467a4b7c4ca77a21e22a49 SHA-256: 27ae64fd17f8277d2d800ba4f949cf65bb405bdc03c6b88987b3610f4ca1b0ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://coretry.ru/uplcv?utm_term=the+clown+heinrich+boll+pdf+free+download PDF link annotation
    • https://arerp.kr/data/file///22245496628.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/01cd459be16c69ae35fa0b76b5eed2d3/jasufibuvagabegebusibap.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160756fde90ac4---dakaz.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/lowejofolukaweriru.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a35295d85f0---pijodofilutafabo.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/1687479296.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/satuxu.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/06942e1fd576050037a5edbba80a51ca/39942750524.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/70930833500.pdfIn PDF document text
    • https://darshanam.com/ckfinder/userfiles/files/dubebenabesikob.pdfIn PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/wamegamaruf.pdfIn PDF document text
    • https://un7un9b3rl1pa7-99.com/contents/files/letavareluwedoxojaxe.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/8rh8dfl1luth0sl1al57hctiut/46443810257.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/7949669dc64e1ecb27a72d25c761d4b0/surutof.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/833266efe979a287e7dc4e4e3490cddc/viponunupesofogixol.pdfIn PDF document text
    • http://yongqingtech.com/d/files/86876076983.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/97088391219.pdfIn PDF document text
    • https://mayurherbal.com/userfiles/file/79977270689.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/lajizaga.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/b01793819219ada845f0d98e6ee7e194/nubewawu.pdfIn PDF document text
    • https://4of100churchstreet.com/assets/media/files/sunifakesova.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5555974e0---wonupadititofig.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/rasonupaxagev.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_off00010a9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9D 20088 bytes
SHA-256: 3c4f8f352eefd0517ddb9cdaf3fe17c619a1498c2804c0a8fa0d7d20a1814ca7
font_01_sfnt_off00013f28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F28 10640 bytes
SHA-256: e4e9947208f175620ba3000ef740f77fd9ed848126a89da24180c25869780b57
font_02_sfnt_off00015738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15738 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1