Malicious PDF — malware analysis report

Static analysis result for SHA-256 898553f33223b9ba…

MALICIOUS

PDF

88.4 KB Created: 2021-07-20 21:44:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b55b3a79bb7fa58df16256cf69b12c50 SHA-1: 3687a1ff94c1f5b0c5c4785d63c759f9ce4586cc SHA-256: 898553f33223b9ba7dbe5d8119cf4427115601e9213d5e15c0604ac83f233ccd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to websites hosted on compromised CMS platforms or disposable hosting, suggesting a phishing or spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites or download further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://fszhenjia.com/upfolder/e/files/20210623101415.pdf In PDF document text
    • http://bagiez.com/userfiles/file/kowonulaxo.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210606035006.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/febenijuje.pdfIn PDF document text
    • http://zzliuxue.com/upfile/file///potunejobepe.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/65044318872.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160794b13df257---57493719133.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f22372e2d---94461656853.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/tamonilavoretal.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16093cae0c825e---podedumozolod.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/94464252086.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc64fe11f6b---lejavomegisala.pdfIn PDF document text
    • http://allasclub.com/campannas/file/nixiloxuvi.pdfIn PDF document text
    • https://htchninc.com/d/files/64963314925.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1484e58d43---wusen.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/32347396114.pdfIn PDF document text
    • http://tlproduct.com/userfiles/file/mugikofexinolakuja.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075cc20f17ae---64574214515.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/9mbh2rbrn4utp2ns2lnpppt5k9/mamerisipunewokuwoj.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/f71f80a77c7edaf5d55976c5c75602ae/52048896965.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/bavatomegixadut.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aeab7e86857---3073968750.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=15+days+in+hoursPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FA 16716 bytes
SHA-256: c194335bab6c7006e63f7727dca0a26cc6348634134cb6e63c6ab0095b75adc4
font_01_sfnt_off00012541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12541 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D58 10372 bytes
SHA-256: 2033a182736ac68835775c6f317f0d109d378dcf0a8cacb4320c0a7816d272d6

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