Malicious PDF — malware analysis report

Static analysis result for SHA-256 44ef89d58ef4a129…

MALICIOUS

PDF

76.2 KB Created: 2021-09-01 01:22:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 22a727e13344e9fafc9f19b9aa7f7e20 SHA-1: 59433023d9327733a74ddd929d580a2dcbb768d7 SHA-256: 44ef89d58ef4a129238a547e2dc075da3086974db8e3294e3d5f0ab79714aa42
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating link farms on such sites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://catamma.ru/uplcv?utm_term=energy+dividend+aristocrats PDF link annotation
    • https://varbackaforskola.se/ckfinder/userfiles/files/xupuwanerojaruleva.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/0vapffe5opgkf288r53gakka3u/71958746776.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/23113333156.pdfIn PDF document text
    • https://linker.tw/files/77902145926.pdfIn PDF document text
    • http://compufoxmail.com/userfiles/file/xeruped.pdfIn PDF document text
    • http://rayer.cn/d/files/70215546717.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d8426a4ac---minukakuf.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/93282570502.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16079fa5adaebd---vemomunufowamikute.pdfIn PDF document text
    • https://giasusinhvien.net/upload/files/92228706286.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/0b1dd033e7dfbdad5f8c5f12c734b677/busikopovo.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/37700069679.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/45c886b3b349a97834d5e4dbc865c2cd/fosipivibubidiv.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/40268382231.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210822080015170.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/wedenufebuzabitopimar.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/9b0c8dec2bc5690bd664d688e26aca96/12404026102.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/836b0411b5323256f3afb9c09e448a81/firovabitokiz.pdfIn PDF document text
    • https://orsolyajuhasz.com/ckfinder/userfiles/files/76951758728.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/3pnl96j6ent2r2c64niu6p30bu/14020532530.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc68f499db---vaxavijefawateniw.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/45777217572.pdfIn PDF document text
    • http://93564497.com/userfiles/3951286892.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/jasomunirojebo.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_off0000c3c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3C1 17364 bytes
SHA-256: 386d1585e0170e158f7f45848073fcdb7b5659b8f3e63392b2df57fce97af115
font_01_sfnt_off0000f108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF108 10664 bytes
SHA-256: dc18cb293526dca0ed48469901a95365f1cf2d99634b82bb589bba4e139e1881
font_02_sfnt_off0001096d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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