Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2c9c29bd785aa29…

MALICIOUS

PDF

77.2 KB Created: 2021-10-05 04:35:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4ddfe6ca3c94924f8bebc59cedd78d55 SHA-1: eda1c1dd7ffef7efb7cc4767296ac2503075d1b2 SHA-256: f2c9c29bd785aa29a4f46f3354e12efc740bc47b2badcf4453b10576745190a1
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised or disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL analysis point to a malicious link aggregation pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://catamma.ru/uplcv?utm_term=job+knowledge+performance+review+phrases+examples PDF link annotation
    • https://pacantioquia.org/aym_image/files/7056864380.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///52207206267.pdfIn PDF document text
    • https://laatuwhuisweerstralen.nl/upload/file/76142025741.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/69767778534.pdfIn PDF document text
    • http://msiutilities.biz/documents/30021582305.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/1463283107.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/1f4a8bf4c542fcd6565e66192fea9235/22562523745.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/wogomuden.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/xomojanuruna.pdfIn PDF document text
    • http://xn----8sbemnkjd7bfu.xn--p1ai/design/img/upload/file/rusufajegi.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/3k2v0jloha7q9ahl7lq58qg037/7563280957.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1615a5016916b8---92948455198.pdfIn PDF document text
    • https://indiantiffin4me.com/nbloom/fckuploads/file/88726614551.pdfIn PDF document text
    • http://bordahusfeldolgozo.hu/editor_up/reguloxamogogefazini.pdfIn PDF document text
    • http://revize-elektro.info/UserFiles/File/bemabamuwikularibise.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/50002693485.pdfIn PDF document text
    • https://makenie.com/upload/files/86016888490.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146ddc89e9f2---50042683590.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/zusaz.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/629ac5c1228d88a6bfb9e3979c50341e/40830533517.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/25326507386.pdfIn PDF document text
    • https://beta.nhatthiengroup.com/files/uploaded/files/vogam.pdfIn PDF document text
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/xotumab.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_off0000c86d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC86D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e07f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07F 17016 bytes
SHA-256: 597bb0943799ac519913833eb3008be7bb01c62f3ca170403ba1b647103b2ab1
font_02_sfnt_off00010c37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C37 11444 bytes
SHA-256: abeb56e4eb2f18d80847336063fa4bd50e7a4cd4635bc8488f3547b3c39c2241