Malicious PDF — malware analysis report

Static analysis result for SHA-256 037cc97a702ae9cb…

MALICIOUS

PDF

82.7 KB Created: 2021-09-16 18:52:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a5e5f034127bbead6021512aeb72f64b SHA-1: bec463e48007816d059215aeb35845714f6056f6 SHA-256: 037cc97a702ae9cb9166e86caf9e577fe07992cd4df78d589c8c7a354a5242b3
156 Risk Score

Malware Insights

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

The sample is a PDF identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites or are part of link farms on disposable hosting, suggesting a phishing or malware distribution attempt. The PDF structure itself is also noted as having duplicate object bodies, which can sometimes be used to obscure malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/puwamigovob.pdf In PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/vorizozor.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/83956927066.pdfIn PDF document text
    • http://fatimaartwork.com/userfiles/file/62718725668.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/jevitozorimukuso.pdfIn PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/21727627382.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/80790093301.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e625b777e2a507c715f9f536ea3fae00/mesurajipedufapu.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/betusirufezubunev.pdfIn PDF document text
    • http://tacchigroup.com/public/thread/risorse/file/11889954313.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139854759d07---65153929906.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/8429359990.pdfIn PDF document text
    • http://www.abcklima.hu/data/editorfile/tufimazu.pdfIn PDF document text
    • http://taigesw.com/upload/files/39283201204.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/40f686795e64c7e6ec9c117dd67f7cba/93321563799.pdfIn PDF document text
    • https://0922.sproname.com/files/userfiles/files/nazilusokefavuvikelaribow.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/lanuda.pdfIn PDF document text
    • http://emiem.pl/public/upload/ckfinder/userfiles/files/buxipubatafudebowijagokiv.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/vufovaxejugubi.pdfIn PDF document text
    • http://labotinnghia.com/img/files/fasinutewujebupep.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/85890999292.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/tatek.pdfIn PDF document text
    • https://x-software.cz/data/file/movevumuxaxiwubimenen.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/notafazoximefonigaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=explain+the+architecture+of+osi+modelPDF 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_off0000ddee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEE 11072 bytes
SHA-256: 043bff916b496c695649ed02d58a1544e1ec0755a95ebd9508f009edbd4c423a
font_01_sfnt_off0000f785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF785 17672 bytes
SHA-256: b434385540716ff49719788181f8a4f28832156fc1cf4bc8d4b01362ef63d123
font_02_sfnt_off000124c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1