Malicious PDF — malware analysis report

Static analysis result for SHA-256 c160dbab65e92cd9…

MALICIOUS

PDF

75.9 KB Created: 2021-09-15 09:26:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dcc5bb18e81b615d4f65cbfdbe923aa2 SHA-1: 6f41210358ab8d66c1bc933bd14f1fe8335cc399 SHA-256: c160dbab65e92cd90c26f643333f4e73fa73a986cbf2f1cd79677760401f53e9
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier with high confidence. It contains numerous external URIs and link farm heuristics, indicating an attempt to redirect users to malicious websites. The presence of compromised CMS upload links further suggests a distribution mechanism for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://laborke.ru/uplcv?utm_term=bandookbaaz+online+movie PDF link annotation
    • https://lifeteacher.tw/uploads/files/202109091230597809.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/magodojadezikutapobowe.pdfIn PDF document text
    • https://livres-arts.com/ckfinder/userfiles/files/bevej.pdfIn PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/domigozit.pdfIn PDF document text
    • http://wohingltd.com/userfiles/rimuresukeninolulute.pdfIn PDF document text
    • https://saglamahsapkutu.com/img/editor/image/file/96011173846.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613295195afe9---matisumiwew.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/88877638283.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/reramexufukanubufefin.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16133308d5fd9a---gakopi.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/mutagetowuvadaxagukujena.pdfIn PDF document text
    • http://pieseclimaauto.com/files/file/dosuvejanitawuwewikuruf.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/mogedixanomufe.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141736d01e66---93983119666.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/xilosamatupex.pdfIn PDF document text
    • http://kcemsp.org/upload/editor/file/9694071686.pdfIn PDF document text
    • http://eskuvoiiranytu.hu/blog/file/54812827422.pdfIn PDF document text
    • https://paeonia.ch/userfiles/files/81899754642.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/98774664441.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/239a7390aa41452f54365364c142b476/woserubuvaxegifab.pdfIn PDF document text
    • http://dentali.cz/files/files/11317566833.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/44230212970.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_off0000c736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC736 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4D 10452 bytes
SHA-256: 63c799ae12f112de771b395f9eedccabedc65cbee5ee98c74a928fd09dbee660
font_02_sfnt_off0000f6fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FE 16668 bytes
SHA-256: 372323ddd28600976a0839200d39819f1a5cab4c736f1326310c7b49a52b1f46