Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4aa17ad1dbeabdf…

MALICIOUS

PDF

74.4 KB Created: 2021-10-21 01:30:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 240d7ea56413636aee731a89ee567e3d SHA-1: a292ea4c7b9611d4d33855526851d4055e3e55f7 SHA-256: c4aa17ad1dbeabdfd03a0522f533c7ff0041d764c03898c71965ec460d597924
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The heuristic 'PDF_RANDOM_URL_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest malicious intent, likely for phishing or malware distribution. ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=character+of+introvert PDF link annotation
    • http://piotrkowska77.pl/zdjeciafile/dulumiwiwegol.pdfIn PDF document text
    • http://bassonconsulting.mc/userfiles/file/notikekas.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/dc7c620a16560fddbf96aff851aa2a9a/lurojosuramel.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/zuwatixetiba.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/87075368812.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/tokasuxuguzakob.pdfIn PDF document text
    • http://abworder.com/uploads/files/59309525999.pdfIn PDF document text
    • http://usateatop.com/_upload/files/tusidipa.pdfIn PDF document text
    • https://sharedsynergy.com/userfiles/file/volokukobup.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615d50ae48d2b---gejuzuborikizonipu.pdfIn PDF document text
    • https://igk-lilienthal.de/downloads/wanagavevijujunagoxewino.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/nopavi.pdfIn PDF document text
    • https://gregoryshow.ru/files/file/zupiluxetina.pdfIn PDF document text
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/65606040902.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/puveduzitabalemipil.pdfIn PDF document text
    • http://autokolcsonzoszolnok.hu/admin/fck_upload/file/8850403890.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1616cdbec90789---98794855727.pdfIn PDF document text
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/vofisewur.pdfIn PDF document text
    • https://turasmobilya.com/img/editor/image/file/28252730558.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/18361369709.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/sewit.pdfIn PDF document text
    • http://falerisztika.hu/tmp/94644187530.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1615618d2a9118---86114525244.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/dorivorafufegerewodugobi.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/69871335879.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/wuwixix.pdfIn PDF document text
    • http://synowka.pl/galeria/file/misalaninawakobekapena.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_off0000c38d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC38D 16072 bytes
SHA-256: 168f9dcb7f9ede3fa860f81014784e6625e10aca06447f63701acba8b0d71751
font_01_sfnt_off0000ec78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC78 10316 bytes
SHA-256: a9a5c78c274dc47f7c2496bd7fcf7ce3c2fc65d91b80f048551caf1d10cf1090
font_02_sfnt_off000103bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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