Malicious PDF — malware analysis report

Static analysis result for SHA-256 41e6ca875512a262…

MALICIOUS

PDF

82.2 KB Created: 2021-09-15 00:10:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 943c6daa50d4c056dbbfc5acd594b57a SHA-1: fd1c633f6669dc5a7126bca6f76949718c75c37d SHA-256: 41e6ca875512a262e33ebc1b5f2a92c5ce287d81998015b56b63d42ab2bdd3cc
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier strongly indicated maliciousness. The document body is heavily obfuscated and appears to be generated content rather than user-readable text, reinforcing the interpretation of a link farm designed to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 5

  • 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://flyags.com/editorResources/file///sonejume.pdf In PDF document text
    • http://tucholainfo.pl/userfiles/file/nakutelegakurasoguzelipob.pdfIn PDF document text
    • https://literie-depot.fr/UserFiles/file/jebozu.pdfIn PDF document text
    • https://www.casestilistas.es/ckfinder/userfiles/files/62947437693.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410de11cd11---penasisobisakupata.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/d239c420d511b7d5bceecd20346dbc68/wimiworawedeg.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/jesokagifezizomazeduwide.pdfIn PDF document text
    • http://kapfenberger-schuetzenverein.at/userfiles/file/36124233780.pdfIn PDF document text
    • http://thaiwoodengames.com/files/upload/files/wiwukibid.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/ziriseful.pdfIn PDF document text
    • http://sparkpro.lv/content/file/sujukix.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/suporamijonutefodez.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/65334484576.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/mudamamudi.pdfIn PDF document text
    • http://baovecongtruong.com/upload/files/73727326654.pdfIn PDF document text
    • https://mollis.rs/files/vutalofunexi.pdfIn PDF document text
    • http://nbkhjc.com/uploads/202109/file/210904195740064616i6h7gd2j8xl0.pdfIn PDF document text
    • http://verzorgingsindex.nl/images/uploads/riboxusuwagesuba.pdfIn PDF document text
    • http://htygroup.com/upload/files/pawav.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/77886786372.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/161410d80d952b---75683865378.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/47777482087.pdfIn PDF document text
    • https://mgrenginiai.lt/ckfinder/userfiles/files/67258852025.pdfIn PDF document text
    • https://fultoys.com/userfiles/wumolasimuzizebilosatopi.pdfIn PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/jigivopozekikadija.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b480bca7caa07e8186d8807e9c089287/nimuladelazolatamapajo.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210907161251146.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=glass+tree+housePDF 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_off0000de1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1C 17776 bytes
SHA-256: b7dbd1ad4b4ddc195e84afa0457fcf13e881f2a746b7bcad1ab1ac0b5fcb599e
font_01_sfnt_off00010c20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C20 10148 bytes
SHA-256: bc9e56eea553455eddb99a8a6f7dcd6f376c356e70ef5d5a5608f75456603dad
font_02_sfnt_off0001230b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1230B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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