Malicious PDF — malware analysis report

Static analysis result for SHA-256 e483de7a075d38c6…

MALICIOUS

PDF

70.7 KB Created: 2021-09-26 14:49:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0031839b7feec2cc7ab0f3fd210c71ad SHA-1: bab13636eb9592640be16a37bfea2b8ad31832df SHA-256: e483de7a075d38c69d149f9a58208273ceda742f8775453c6b89f5e60bac3e24
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The presence of 'utm_term' parameters suggests a phishing or SEO manipulation tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://philabc.ru/uplcv?utm_term=mario+kart+super+circuit+gba+rom PDF link annotation
    • http://aven.su/userfiles/file/19672149168.pdfIn PDF document text
    • https://www.confirmedtour.com/files/37991026200.pdfIn PDF document text
    • http://domosplast.hu/files/file/16859103338.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/67056892012.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/ml4n3kjtblp9nv6hnuvvadqv0b/lojipebo.pdfIn PDF document text
    • https://fundacjanadzieja.com/images/wyswig_images/file/38917209987.pdfIn PDF document text
    • http://pbhdom.eu/userfiles/file/lewidifapuninulixot.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302f24b4952---81342761359.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb26eb2f49---34245762495.pdfIn PDF document text
    • http://come2menorca.com/images/file/kojamidinemanosadibobekip.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/jusegatifomopujezekarolu.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/malovolubojilatekakex.pdfIn PDF document text
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210926_191531.pdfIn PDF document text
    • http://teleinwestor.pl/userfiles/file/20707902249.pdfIn PDF document text
    • http://baltyk.recykling-rejs.pl/imgturysta/files/niduburaf.pdfIn PDF document text
    • https://lotteppta.net/beta/assets/file/bukemo.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/nisuxifil.pdfIn PDF document text
    • http://sowaprojekt.pl/files/file/dapifinozutiwufesorive.pdfIn PDF document text
    • https://paeonia.ch/userfiles/files/jufivixarulofafafeso.pdfIn PDF document text
    • http://fruhmann-elektrotechnik.at/kusizubewofekaxidijutup.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/96035654141.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/69755185123.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_off0000b1ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1EE 10892 bytes
SHA-256: 41518cbdadd03b5ac26aa6b0d697e3b1a43ffa7e47664180b411b46ab300f2dd
font_01_sfnt_off0000cb07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB07 16428 bytes
SHA-256: 5353448fb126391217c310dcd2fa2fde456d4a243068e6fa3fded335edcc30b3
font_02_sfnt_off0000f535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF535 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1