Malicious PDF — malware analysis report

Static analysis result for SHA-256 456149df83ace81f…

MALICIOUS

PDF

106.2 KB Created: 2021-10-05 21:43:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 72813411ce5e22e23a46db2c6c7afcd4 SHA-1: 33483903faa20e5697451f3dac237b6956c2dbf0 SHA-256: 456149df83ace81fe0bb06f20ac992b1e15d4ad5b949807da60353e66f2cc704
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs and exhibits characteristics of a link farm, with many pointing to disposable hosting or compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond what is inferred from the URLs and heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9863

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://nomylo.ru/uplcv?utm_term=how+to+enchant+sword+with+sharpness+1000 PDF link annotation
    • http://aasghsflqsae.handylover.com/upload/files/51256586673.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/gomuvabajegubu.pdfIn PDF document text
    • https://smartmedia.ro/app/webroot/files/userfiles/files/jagelirugavofu.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/41538277254.pdfIn PDF document text
    • http://kezmosas.hu/files/file/wasufate.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/86057731086.pdfIn PDF document text
    • http://zlhk.ru/upload_picture/file/8702670478.pdfIn PDF document text
    • http://dgkno.cn/upload/davodelude.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/61140585461.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155a5e33b297---tomazibi.pdfIn PDF document text
    • https://westhygiene.hu/editor_up/33797756589.pdfIn PDF document text
    • https://crawfordpoint-ca.seeninherd.com/files/zifitotepojodawulonozutab.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614164628f524---32032244276.pdfIn PDF document text
    • http://cofetariafraguta.ro/UserFiles/file/bazipajogozuvase.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/1968835246.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/26549193041.pdfIn PDF document text
    • https://www.adom.biz.pl/ckfinder/userfiles/files/fuzuraviporofenirasa.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/nokezukaja.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16156877d174a0---barito.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/nalasuwisexilotev.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/75645767392.pdfIn PDF document text
    • http://xn--b1adrijbbb.xn--p1ai/upload_picture/lapimipugozav.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/vumokefebadun.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/94860004104.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011a2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13246 10816 bytes
SHA-256: 201ed26bce97990643287bef143ef225e800a79e3f1f98cfb3882c52fa97a893
font_02_sfnt_off00014b33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B33 16684 bytes
SHA-256: 5786d7639d2cc1522a1a3889fae5b5c9fbcbd5f5c9de2f5a2930a0e54327038d
font_03_sfnt_off000162cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162CC 21372 bytes
SHA-256: 5cbda3d1faa694a47130649824f32747536ae1d3e3ff073ab01a836ae281d489

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