Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe75156a392902f6…

MALICIOUS

PDF

71.2 KB Created: 2021-09-24 23:44:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 95bfeec3b6491ee98e42c8351d72fc4f SHA-1: da412c7449d8c01b12d6b55ba3dfcb56b893df9a SHA-256: fe75156a392902f65f8dc6c7e7a95fd442f1677098e1b431a260b8bdfc527095
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting it functions as a link farm. The presence of these links indicates an attempt to direct users to malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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.paseppe.gr/ckfinder/userfiles/files/vafobif.pdf In PDF document text
    • http://mamtomchabahai.com/uploads/files/files/26524095299.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/94393574379.pdfIn PDF document text
    • https://kolegium.inaheart.org/upload/files/37848167730.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/wakasope.pdfIn PDF document text
    • https://badoza.net/userfiles/file/72338106057.pdfIn PDF document text
    • http://wuyioutdoor.com/userfiles/file/49085208218.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133cd353b56b---54936000348.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xepovedawubozenikod.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/31039015315.pdfIn PDF document text
    • http://96rangjai.com/userfiles/file/ririkubetopip.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161386cedf3a3a---46733605130.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/zivodifedefexasofuzapi.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/21860860405.pdfIn PDF document text
    • http://musicandyouapp.com/webupload/editorimg/files/35121499213.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nobaduzekukejebojuxubov.pdfIn PDF document text
    • https://aqualibramontois.be/fckdownload/file/99775361106.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/54506922399.pdfIn PDF document text
    • http://tiquital.com/documentos/file/29785957724.pdfIn PDF document text
    • https://salonrewards.ca/images/file/tulidobebenozesovojo.pdfIn PDF document text
    • http://gongin.humenia.com/upload/userfiles/2021/09/files/210913083048.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/majerogizojex.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/tudokefijaga.pdfIn PDF document text
    • http://iknow.pl/files/file/gutum.pdfIn PDF document text
    • http://chikatere.com/Upload/files/xemine.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/hrnn019f616a44fokq2p08v48e/92639949077.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=reading+comprehension+pdf+with+answersPDF 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_off0000b544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB544 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD5B 11152 bytes
SHA-256: effdae9388832bc2cafc38dd8d129133b848e7ad1b3db90cf296b2a8741df2b7
font_02_sfnt_off0000e708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE708 15780 bytes
SHA-256: e8d6a1c7fbdb777c7f26a5e6cb32ac0a5f7a66fb9494ac98bd32a3d0b5202652