Malicious PDF — malware analysis report

Static analysis result for SHA-256 854040634cd9406c…

MALICIOUS

PDF

87.3 KB Created: 2021-10-14 08:08:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 458fd9189577a62cdb81930f8604322d SHA-1: 291362c7042fa02b385498c8fb5996a3afa0313b SHA-256: 854040634cd9406cc77ac5de12cd324c7f88307366751524a605cdfc85ddb751
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to a variety of domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to direct users to external content. The ML classifier strongly suggests malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://oniceh.ru/uplcv?utm_term=indirect+speech+today PDF link annotation
    • http://americasbestwingsbeltsville.com/uploads/files/89987344950.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/48036814328.pdfIn PDF document text
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/35388940893.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///dakovofozu.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/91619507399.pdfIn PDF document text
    • https://mahae.hu/files/files/tanabeguduvojifebiza.pdfIn PDF document text
    • http://hnyinfeng.com/d/files/14029206357.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/sisoxopower.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/90900261523.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/23908653253.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/dataxesevobusoja.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1616763c76fbbd---17671679103.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16167743de2fbe---bizadep.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/gunuvomivaresaxizat.pdfIn PDF document text
    • http://baove24h.org/upload/files/banojubiwugezarexogojeden.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16142c326081e7---23873435017.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/76518205484.pdfIn PDF document text
    • http://nfc.soo.jp/file/desizijapam.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/161610aaa05d55---49662120877.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/rugumorosamuj.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/68463121343.pdfIn PDF document text
    • http://bresky.cz/res/file/notufuzezimadezorolejekag.pdfIn PDF document text
    • http://lagrupacio.cat/file/golexawijo.pdfIn PDF document text
    • https://crcnueva.naturasoftware.com/uploads/images/files/80651606486.pdfIn PDF document text
    • http://uchid.com/uploads/file/83020545897.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_off0000f18c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18C 10632 bytes
SHA-256: 0fe10903e9db88057e61764671b50f02011b1b148d17f97ca4d91969ddf93b41
font_01_sfnt_off000109ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CA 18116 bytes
SHA-256: 26f62a971c3b24fe7ac0a0cd9808e493454f15cd08f32a5640209f0e69406722
font_02_sfnt_off000137f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1