Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1e45ec4e2aa2671…

MALICIOUS

PDF

69.1 KB Created: 2021-09-18 15:10:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3ee2a6bbda45770ea0fa88c845f40bc3 SHA-1: ee65533408319bb94ac798152c9de1dc04428ccb SHA-256: a1e45ec4e2aa267188e91e2c2f604d4d5810ab43a6094e1ab5c616ddb1a52c4a
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm containing numerous external URIs, many pointing to compromised WordPress sites or disposable hosting. The embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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=gta+3+full
    • http://landpas.pl/upload/file/tekaribozedovetifip.pdf
    • http://noithatmfc.com/media/ftp/file/lanoka.pdf
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/23353198952.pdf
    • http://studiorinaldibedin.eu/userfiles/files/11989104883.pdf
    • http://toyotarent.hk/FileData/ckfinder/files/20210909_D6A0555D715AC692.pdf
    • https://ladachess.ru/userfiles/file/62858998332.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/29ccde47dc274623a075dcecd90ed221/44961496013.pdf
    • http://silverk.ru/img/lib/file/gewimewedagutizegu.pdf
    • http://hrampetraipavlavosstanovlenie.ru/content/images/user/file/40452639618.pdf
    • http://fornacedelia.it/userfiles/files/dozavatusewetasimol.pdf
    • https://minhgianggroup.vn/upload/files/71781948965.pdf
    • http://porpora.eu/imagenes/imagenes_contenidos///pegafijodovuzari.pdf
    • http://myarrahnu.com/mo_images/files/92838580176.pdf
    • http://autoscuolepintozzi.it/userfiles/files/23314055866.pdf
    • http://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/68090555086.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300abe6ef91---fananuka.pdf
    • http://hzkontejnery.cz/ckfinder/userfiles/files/gukimepixasimuze.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b8a14bcdb---danifunimubaguvigarere.pdf
    • https://doublehair.center/upload/ckfinder/files/53031654704.pdf
    • https://texigo.tw/upfile/files/2021/09/02/lobarinowubu.pdf
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/191982793e2e570e2eb938d135deb8ea/62642853543.pdf
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/48103642086.pdf
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/xoxefesafegobelaf.pdf
    • http://storemisr.com/uploads/files/83132824847.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b510.bin
601a45460090fd6ea712017adcd0dd6b7b98131d21cb24d8c9f579d92b1da2cb
pdf-font-stream PDF embedded font (sfnt) at offset 0xB510 9800 bytes
font_01_sfnt_off0000cabc.bin
48758de85b47c42021717d6ca0fdf12e5cf1a39b9c8b6e49f343551145843e42
pdf-font-stream PDF embedded font (sfnt) at offset 0xCABC 14576 bytes
font_02_sfnt_off0000ef09.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF09 16792 bytes