Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1ab32d0eff14328…

MALICIOUS

PDF

83.8 KB Created: 2021-09-14 13:46:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a2d03b205d0adae83e26eab9117843c1 SHA-1: 5862e966880e4c168ca6bb784dc0e267a8026e63 SHA-256: e1ab32d0eff1432811c6da55597aa9babc4ea908c68057b41f756e9a175451cf
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the primary attack vector appears to be the exploitation of user trust through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/uplcv?utm_term=awt+and+swing+in+java+pdf PDF link annotation
    • http://orvositudasbazis.eu/images/upload/file/91793587540.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/dotevamodijererodo.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/jufemijanikates.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/446b24f601c6d125df0e54e0c7e6aa37/76673367887.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/18765451205.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/65924813999.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/174c1850c51b0c0399167762a270a23e/98832867392.pdfIn PDF document text
    • https://yaofangpeixun.com/upload/files/75836748989.pdfIn PDF document text
    • http://iranjobex.com/cache/fck_files/file/vibabaveramubalibu.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/87781603486.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/161337f91ce242---46478451881.pdfIn PDF document text
    • http://autolubitel-irk.ru/userfiles/file/51106879042.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/suwefarubolepeboxuwog.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/29428454646.pdfIn PDF document text
    • https://ptogel1.com/contents/files/49212911805.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/guxusolupigutubekumekipu.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/xevisamemexabo.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/mdksdp1h5olfjbolesn4kefbu5/ranagawakaromi.pdfIn PDF document text
    • https://cesiedizioni.com/userfiles/file/12316642846.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/28342242650.pdfIn PDF document text
    • http://senvietsystem.com/ckeditor/upload/files/97560336291.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/19161144505.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/61677251194.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_off0000e06f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06F 18408 bytes
SHA-256: c39dc81b0505d82ad3159e32ce9b8b08abb7d9050322f800cbb7f650657d3368
font_01_sfnt_off00011141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11141 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12958 10536 bytes
SHA-256: 03d3c9eda9a97f56b76d6eff4330aa2b88091b0b14a664bbb0759632512051eb

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