Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec378decb32f95fe…

MALICIOUS

PDF

95.8 KB Created: 2021-09-06 12:46:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0bba262b876777ae29414d0dfcfa9b38 SHA-1: 57f348300a54237eb619d0b5351963c2cdfa9876 SHA-256: ec378decb32f95fe63482ace16bd1daa3c7d8696a97e176a4b3e717885f0d8bb
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identify it as a PDF link farm, with multiple URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, providing no further context.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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 http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606eab23793e0---tijajin.pdf In PDF document text
    • http://riverbendhay.com/clients/4/4e/4e1cbd84181290ddb66fb035c9950ff6/File/piwemal.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/0c5ac9d98b58c8617e6db2e4fde54d61/pubuvagilujibowifukusil.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/lilaxo.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/66178705111.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/92155720973.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/nazebavukegelinazutojopa.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/kapesizupazidoxawozez.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/0ec5f21368705e1b69d22887544a1b70/gubunufiwenorejusojuvarez.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/wilixobelavunaxisipeji.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/pefut.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/77551931061.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/221452118187.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/4ee7aa37859fec08c04e83daa82591ac/roloximiruzejegoto.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16098ece0e99d6---33512173816.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/93642097059.pdfIn PDF document text
    • http://leilehua76.com/clients/4/4d/4d80c013f15dbe3c797666a457780dca/File/mebiripudedikefuwe.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/95076062749.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/h0fr91gcs659cuvaqr4ec814e1/31308304180.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/sivaropa.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d52af28c4---87617877977.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a419a05b55a---42162488703.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/kibugedezuputelupunum.pdfIn PDF document text
    • http://hanarotalk.com/userfiles/file///kazetelewijubage.pdfIn PDF document text
    • http://one9five.com/userfiles/files/45713854440.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/3568311023.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=malformations+cardiaques+cong%C3%A9nitales+pdfPDF 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_off00010521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10521 11356 bytes
SHA-256: 7bab5b6f13f1b6fb835cc475592f9ec51fe9b9fce6aa2f20acdcbc3bfccfffd1
font_01_sfnt_off00011f0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F0A 22044 bytes
SHA-256: 1583b22e4afa3c081bcf120793a01423986cf2de70bd620c155ec3071208dc60
font_02_sfnt_off00015698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15698 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1