Malicious PDF — malware analysis report

Static analysis result for SHA-256 a18c977731ea5680…

MALICIOUS

PDF

80.1 KB Created: 2021-10-08 02:13:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e4a1d3539ed96724e89418f18b0a69a7 SHA-1: ed7f18dc9371b90eaa7f1a9bad1addfdd498720a SHA-256: a18c977731ea56807e29b476dc670109d6d7b2f9c36970a5500910d6d320b8a1
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classification and ClamAV detection as a phishing trojan. It functions as a link farm, containing numerous embedded URLs that point to external websites. Some of these URLs are hosted on compromised CMS uploads or disposable domains, suggesting an intent to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://garglob.ru/uplcv?utm_term=facts+about+nutrition PDF link annotation
    • http://birkhoffhi.com/userfiles/files/gapefuzizosivexabapan.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/e34ef6a660b196547297c28245c16e1f/74181318148.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/jakek.pdfIn PDF document text
    • http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/budanikofagotubiganukom.pdfIn PDF document text
    • http://xn--80aafkatcapceshpicpg3h.xn--p1ai/pict/file/nafogelafujulavuf.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/4f222cd12d8e6c79f1360e25488b3a14/xarekifegodegovebufo.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/88376298975.pdfIn PDF document text
    • https://tidurmalam.com/contents/files/36802353021.pdfIn PDF document text
    • http://schokobrunnen.com/idata/49435348786.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/16463959614.pdfIn PDF document text
    • http://www.miyadenthai.com/image/upload/File/mutotisisexefe.pdfIn PDF document text
    • https://lorus.rs/files/javirijilozanogijir.pdfIn PDF document text
    • http://lifebeachvilla.com/uploads/image/files/27381405485.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/ladazipesu.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/rivugifevibika.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/nowil.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202109200515542561.pdfIn PDF document text
    • http://wedding-box100.com/uploads/files/202110071741552558.pdfIn PDF document text
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/94533414208.pdfIn PDF document text
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/2831687245.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147e818a9f01.pdfIn PDF document text
    • http://starinviter.com/ckimagefiles/5918075105.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1614273b096fe1---ninebuvafewawesomoke.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/divagomusetixituv.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_off0000d709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD709 10260 bytes
SHA-256: c21cadfd942dc7910dbcec627f864b97773368842e49e1b643a98ea92e14dc88
font_01_sfnt_off0000ee3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3D 17364 bytes
SHA-256: 80c47d9b5264b8cfb799bbaa149808827de0bc08239a30b5cf3ac8e5c2f97876
font_02_sfnt_off00011a84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.