Malicious PDF — malware analysis report

Static analysis result for SHA-256 c29b183452154a98…

MALICIOUS

PDF

82.6 KB Created: 2021-09-17 07:10:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: de4a957e1b76842b5359308030393ff7 SHA-1: 273cfc8774e45e16e620748631ca95c70c174146 SHA-256: c29b183452154a98bcb6674ecca42a2637bd487024af6026b9a59f0281e8823b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this. While no scripts were explicitly extracted, the nature of PDF exploits often involves embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://drafthe.ru/uplcv?utm_term=android+app+mobile+site PDF link annotation
    • https://hamzsabegi60szallo.hu/UserFiles/File/6610739288.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/86851037715.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/reweboxegunexokovije.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613036b7e3b39---84707459924.pdfIn PDF document text
    • http://drigungkagyurinchenpalbarling.org/upload/userfiles/files/8685996074.pdfIn PDF document text
    • http://halanmilk.com/upload/files/62250418515.pdfIn PDF document text
    • http://turnyras.lt/Files/file/susinidavaposorava.pdfIn PDF document text
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/18929029793.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/b6bucaqfi71p7d0k2rghja0sa2/21114660185.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/nusototikedu.pdfIn PDF document text
    • http://abwrva.com/uploads/files/71717636043.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613316b4bea66---gisalibox.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/ligag.pdfIn PDF document text
    • http://atel-j.nl/uploads/files/relomefojasolifaziwidawif.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/zutiziwitojemido.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///rarujowufiwatezolabekalu.pdfIn PDF document text
    • http://naszemotyle.natura2000.pl/imgturysta/files/23711612809.pdfIn PDF document text
    • http://snp-ent.com/files/fckeditor/file/154239658161315cbf49299.pdfIn PDF document text
    • http://aa-nusd.jp/89059834915.pdfIn PDF document text
    • https://gencatakan.com/upload/file/17425429161.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342819e2175---46304850585.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/bogixexapimokewevex.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/47103375708.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_off0000e01f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF836 10676 bytes
SHA-256: 87288a4b639b170c77c4e8fc7960f29b27e45c174f885e089a2e8635531ae721
font_02_sfnt_off0001106a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1106A 17168 bytes
SHA-256: 62ed83704a205dd02c30a0d60f3aac2029e56ec16488fc54adbe6ac49bb9e32e

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