Malicious PDF — malware analysis report

Static analysis result for SHA-256 5338938cfbb93506…

MALICIOUS

PDF

95.8 KB Created: 2021-09-01 11:10:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9d52352701462206648d9dfd94533597 SHA-1: aaf56918fadeb258604a09d31c169b572e181711 SHA-256: 5338938cfbb93506e86aa9d15dfbf0349669051becd32f055eff7d168e752851
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. These links appear to form a link farm, likely intended to redirect users to malicious content or phishing pages. The ML classifier strongly indicated maliciousness, supporting the assessment of a link farm designed for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://archism.ru/uplcv?utm_term=sites+to+download+anime+in+bulk PDF link annotation
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608470874adee---65597397910.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/dc34fb1c5186de08b2a509d9ee1f953b/mowamexiwe.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607de73d3540b---19214896575.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/xajunagofejogenuwu.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/4793611753.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/95107558129.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ae6b00dfb42---wavapubegu.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/42095bf26287bcadbccdea62c9bf89a5/xunesopi.pdfIn PDF document text
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/9vq0op0tagptuf8rk513egiq4n/14222589780.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/junalogulozakifidagez.pdfIn PDF document text
    • http://bluebiz.kr/userData/board/file/gopubukudafafir.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16075fa5d05166---32955433787.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d930de60bea---82717808226.pdfIn PDF document text
    • https://szamitogep-szerviz-javitas.hu/ckfinder/userfiles/files/61273929288.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/3ogg77d1ivkcre9m7tcr45qm01/fakolifefabuligigajidu.pdfIn PDF document text
    • http://vce34.ru/attachments/file/50170823713.pdfIn PDF document text
    • http://optikametuje.cz/userfiles/file/63782110762.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/vawumijirokejufipomemane.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/lojomaxikanotexufem.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/78174591778.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/c8iba3dui5tjkc3jng0l1rilb6/favomezemuj.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/17194411658.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d62784e4084---jikaverikezuzojotib.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/5379d5c6535a10332a578c489ea5b6f2/migidija.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_off000111fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111FC 10800 bytes
SHA-256: e9706de511cda5b6a6836eaf82e83c0f9a5f863ea8627dc4ef6d5d0fbf39621c
font_01_sfnt_off00012ae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE6 17420 bytes
SHA-256: c7f21a5fe07cbece80f2c181feef8bfc7dff47f9280bf8f64f6f129ae5841b94
font_02_sfnt_off0001583e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1583E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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