Malicious PDF — malware analysis report

Static analysis result for SHA-256 eeb21aa893c175ce…

MALICIOUS

PDF

86.2 KB Created: 2021-06-27 07:05:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 803200f31a30ab7c37595b97da021a65 SHA-1: b6f38da42b9317182734b33ffe1d025c49a41b1c SHA-256: eeb21aa893c175ce8fe1faeb035e1a71dc9e37d3de9ac278d03a8caa128e52a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm structure, and the 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' firings strongly suggest malicious intent. The document body is heavily obfuscated, but the presence of external URIs and link farm characteristics points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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=nrz+us+equity PDF link annotation
    • http://stylekd.ru/files/lezudosenivar.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160822b12e0fc3---8338250534.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/gumosigagiladileviguti.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/65863790365.pdfIn PDF document text
    • https://85097781.com/upload/files/femiziputulutizaxavu.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/039e99ee5d24b7417fb4c65bbc96fb42/sesudunesijusavagotimet.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/e63bd09ecb53e2be22d2f826225f6763/gufotin.pdfIn PDF document text
    • http://gistys.com/userfiles/file/vumelapubiraj.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16079362089905---rosevokowedunetiratupuvap.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6df6e6022---28830775136.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/323dkgc3p0autndshcsllivhtu/89967399562.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160be6de63b6ea---wikunalitevelu.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/woxolanu.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160ade67dc42d1---85932214827.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/savinox.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/da857ofgr9uqpehejbslh35ln6/darakabutesubiruj.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/96a07f605b12a262a476693f38149c09/80918509937.pdfIn PDF document text
    • https://mygo.com/ckfinder/userfiles/files/93482701651.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c03df0425---tomevab.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16090e683d481a---49705911039.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160820b0ae242a---96264526915.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/83938931353.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/40311115790.pdfIn PDF document text
    • http://citysuji.com/ckfinder/userfiles/files/gabutaguduxifiberepineki.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/45724615378.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_off0000ee85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10697 17688 bytes
SHA-256: 29ef767ae0074dc59b9bb550232126a20d8fcb6e11891a29b5f0075a85a924f5
font_02_sfnt_off00013518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13518 10068 bytes
SHA-256: 713bf23c0f48277f379cea6929ad1302d410fba898d7575b8351bce046bac11d

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