Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a2005cf6484a2ff…

MALICIOUS

PDF

88.8 KB Created: 2021-09-09 11:16:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f2ea34594012a2a49bd48f65c14b2f22 SHA-1: 1fab021bd9d25a23a75dd2b82fe17f2ff724169c SHA-256: 0a2005cf6484a2ffc38b35d8ea9507617c81630359d73b0142396680b831a1ab
156 Risk Score

Malware Insights

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

The file is a PDF containing numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of multiple external URIs and link farm heuristics points towards an attempt to lure users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://agataklimowska.pl/userfiles/file/43296899642.pdf In PDF document text
    • http://jenan.com/ckfinder/userfiles/files/wivimosutabarawutut.pdfIn PDF document text
    • http://fivelscope.net/fckimages/posilezosunarimeki.pdfIn PDF document text
    • https://jetaime-shop.dvsportbg.com/files/resogu.pdfIn PDF document text
    • http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bukawixaveledixijoponok.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea474c08bf---wujamujajegoj.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/muzisilixelef.pdfIn PDF document text
    • http://sissonne.hu/editor_up/vujujobijagujeveruvewif.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/13791268919.pdfIn PDF document text
    • http://ciskmv.com/css/file/45411219267.pdfIn PDF document text
    • http://ordineveterinarireggioemilia.it/userfiles/files/24803239385.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109090518115973.pdfIn PDF document text
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/retuzumomu.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-8/20210908225845367929.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea955e691a---gowasebug.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/nawozawo.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613944e1755d4---14644084123.pdfIn PDF document text
    • https://cuatudongnhatrang.com/uploads/files/60738819999.pdfIn PDF document text
    • http://seosanhrd.com/userfiles/file/puzobogalidaxerivepeferi.pdfIn PDF document text
    • http://hermandadperdon.es/userfiles/file/maxugevogu.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/94179809387.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/nakewaxoneluvixonixa.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/2796181612.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/53846224840.pdfIn PDF document text
    • https://mimpidia.com/contents/files/vonirepebav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=doom+online+unblockedPDF link annotation
    • 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_off0000f29a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB1 10336 bytes
SHA-256: bc27557ef5fa2b2e0abcb8dcfec072d0abab2050c2235cd51f8e9b358647883c
font_02_sfnt_off000121de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121DE 20360 bytes
SHA-256: 53544c39a22dd13995092fa206579e06f676c6ed71e47297438a620469b70a25