Malicious PDF — malware analysis report

Static analysis result for SHA-256 23eb9f2c91e7330b…

MALICIOUS

PDF

87.8 KB Created: 2021-09-17 03:56:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 9c4c0aa8b51aad6b68bc0ff29f282718 SHA-1: fa2689a4d2e5c2287eb501536d8df827af35c7cf SHA-256: 23eb9f2c91e7330b585ce8d71d815f2aceb80c59806c4fb5e7dd260966e417f1
116 Risk Score

Malware Insights

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

The PDF file was identified as malicious by an ML classifier with high confidence. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. The presence of a QR code lure suggests an attempt to direct users to these external resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://philabc.ru/uplcv?utm_term=how+to+gta+5+on+android PDF link annotation
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161354532ab260---53557883092.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/pempjvm8sn1c0gqc0t8actnh7n/pagebazeduwefokejiz.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/vijekenagipogegelakikarop.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/65614299515.pdfIn PDF document text
    • http://lnimeina.it/userfiles/files/kejox.pdfIn PDF document text
    • http://flyingfish-stay.com/userfiles/file/woxexima.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/49847262332.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/59756395208.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/tibiven.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/fureraxowufejexi.pdfIn PDF document text
    • https://pima-alarms.eu/slicice/file/51365894416.pdfIn PDF document text
    • http://restauraceeverest.cz/userfiles/file/nopabapopataxet.pdfIn PDF document text
    • https://gameclub.by/uploads/files/82799429145.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/17584063295.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/44724385229.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/wupipawijod.pdfIn PDF document text
    • http://mrspk.com/ckfinder/userfiles/files/91668268461.pdfIn PDF document text
    • https://pierreseche.fr/userfiles/file/gojibaboxup.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/98974381505.pdfIn PDF document text
    • http://yokosohk.com/files/fckfiles/file/sononalowepibasa.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/dedosisogi.pdfIn PDF document text
    • http://xn--hazrdner-r4a10d.com/alisveris/yollanan_resimler/file/265087592.pdfIn PDF document text
    • http://husplaza.hu/editor_up/11757012875.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133115db769b---water.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/68949553542.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_off0000f4a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A7 10288 bytes
SHA-256: 7878e177d91c138d2ddb09af7f0385d59c276786c321610d1d82fdd4be3ee911
font_01_sfnt_off00010bbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBD 17732 bytes
SHA-256: e6863a0318f3d2a1d115743b4595e7daf7f948c92fca94c203077a311b0961da
font_02_sfnt_off00013957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13957 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1