Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf2c1e361f04ac30…

MALICIOUS

PDF

70.9 KB Created: 2021-10-03 01:13:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 6048210cfaa29705d74585b0cb019e1e SHA-1: d36bbc813bd825618204c2d94df7814ba8b7aeea SHA-256: cf2c1e361f04ac30252fd09e0b161ed17a4119b784b8d5337f67fed5f5673f8e
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the nature of the URLs suggests a potential for hosting malicious content or redirecting users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://ketchas.ru/uplcv?utm_term=west+highland+terrier+mix+puppies+for+sale PDF link annotation
    • http://sjzhtchem.com/upload/files/gesomuwafubutoporen.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/vuwogexemidifaditevab.pdfIn PDF document text
    • https://auto826.vnpec.xyz/uploads/files/gomuzoxe.pdfIn PDF document text
    • https://petandpuppies.com/userfiles/file/30849480891.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/digodebivugujomufetogotop.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/69730098239.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/95292750632.pdfIn PDF document text
    • http://huemin.com/fckeditor/userfiles/file/tovomadezapilefavirem.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16158d33f47f68---40188810866.pdfIn PDF document text
    • http://ksklinika.ru/ckfinder/userfiles/files/93990431839.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/vejupixoxedijifolepi.pdfIn PDF document text
    • http://tabouligrill.com/ckfinder/userfiles/files/89903434327.pdfIn PDF document text
    • http://web5gstore.com/Files/files/zopizonuvefab.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c47d077c8---wazuruvege.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/xofonoxesukigese.pdfIn PDF document text
    • http://decaiyun.com/upload/file/2110021811046190360z46pb770el4.pdfIn PDF document text
    • http://www.dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/24042588191.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/basapelogazibawutujapoda.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/33469050160.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/2286078181.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/87193227079.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/1a0d83bafb84d5533207f9693cbc0acd/23154282858.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/qsitaagun0ekg9r8ic73noafmp/kumarerubo.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/52b5623bc77beff251ba656108efe31e/satunegepidopugule.pdfIn PDF document text
    • https://ziyang100.com/userfiles/file/art_16331986804854.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/wizavijaziluzupo.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_off0000b365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB365 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB7C 11140 bytes
SHA-256: 99e3276c9218b0f39a11b57c0f260cab940157cc9e2c133ec543af93f257d103
font_02_sfnt_off0000e522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE522 15984 bytes
SHA-256: 7b7511453f76042a1b7f202c3f45b9ca6566dbfd7822fecf9603cf0970a62017