Malicious PDF — malware analysis report

Static analysis result for SHA-256 5622c207c5756f1c…

MALICIOUS

PDF

89.0 KB Created: 2021-09-09 22:05:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c21b3e5f6a58964f83825b62e5456c6a SHA-1: b3d9bc50627244bfa679e3c820a9ab65c162e829 SHA-256: 5622c207c5756f1c1a0a3140bb4bea2a90d0e74a29b42e06134fda47c86a05d4
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users. The presence of external URI heuristics and the compromised CMS upload link farm heuristic further support the conclusion that this PDF is used to distribute malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://macintosh-szerviz-javitas.nuttydog.hu/ckfinder/userfiles/files/18503215848.pdf In PDF document text
    • http://heydarbaba.org/resimler/files/22442546622.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16132527a1f9f9---20234631450.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612ead54ba866---xolelovavuwolasuzajufi.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/puzimefozo.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/31303073016.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/81254666978.pdfIn PDF document text
    • http://cpils.com/userfiles/file/71899441732.pdfIn PDF document text
    • http://potlista.com/file/files/21178207403.pdfIn PDF document text
    • http://oiseau-bleu-morzine.com/userfiles/file/61931634775.pdfIn PDF document text
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/56910961326.pdfIn PDF document text
    • https://phm.vn/upload/files/68091442405.pdfIn PDF document text
    • https://breedlife.com/upload/files/diwamukuxuf.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/jubas.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/69944199801.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/81710669983.pdfIn PDF document text
    • http://chamdure.com/DATA/files/23357123649.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/84357746476.pdfIn PDF document text
    • https://silverlabpupsforsale.com/userfiles/files/gidebijevodug.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/xogomorenidovotani.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/62aa3ee0b4cf28eeca2f5bac41843e05/22252695706.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210903223144.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=discord+download+chrome+osPDF 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_off0000f6d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D7 18276 bytes
SHA-256: 089f045a563e227af5ff7f3a987fcf656348fe5f6f34546728a5f8351dfc61f9
font_01_sfnt_off0001262c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1262C 10624 bytes
SHA-256: 00c5d87e59c25364580ea5ff8d5a9466a63b18895731996d0fbca99ff22789e5
font_02_sfnt_off00013e4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1