Malicious PDF — malware analysis report

Static analysis result for SHA-256 1378d97eb62ff57b…

MALICIOUS

PDF

82.5 KB Created: 2021-09-14 21:18:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 866c96f02f2ff202a64fed7bb9cabb51 SHA-1: 48b1e1f8ca85e46f5f3ced8dc4400353370fd41c SHA-256: 1378d97eb62ff57bd705e5e192bba525ddf380d233e2409c72422574686d7433
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://ketchas.ru/uplcv?utm_term=redeem+genshin+code
    • https://wonwon.taipei/photo/file/38708512731.pdf
    • https://ipekyolumedya.com/resim_galeri/file/40937486872.pdf
    • http://erainbowrealty.com/userfiles/file/nowepejejus.pdf
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/17089ccddd2d354ca2264ba4791fb20e/wojepidaraw.pdf
    • https://euronuts2009.ge/files/files/9941786295.pdf
    • http://businessnavigator.in/ckeditor/uploads/files/gizipojidarasuxuw.pdf
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/de69bcd5b373b8dbf652390c2836c376/sokadu.pdf
    • http://vivo-mebel.ru/upload/file/watajulob.pdf
    • https://bdata.vn/upload/files/17921692888.pdf
    • https://netiko.fr/img/Data/file/89252278341.pdf
    • https://mama-light.net/business_school/uploads/file/80928871974.pdf
    • http://newbusan.net/FileData/ckfinder/files/20210903_BA8D4B505D30E505.pdf
    • https://tadimtursu.com/image/files/44878919966.pdf
    • http://nicolalazzarotto.com/userfiles/files/xedon.pdf
    • http://sun-dr.com/uploads/files/202109121124222361.pdf
    • https://radmangroup-ye.com/rgfiles/file/7605854519.pdf
    • http://www.heksan.com.pl/file/tazipajarikivax.pdf
    • https://lidiyageorgieva.com/ckfinder/userfiles/files/25391908623.pdf
    • https://optical-axis.com/uploads/files/202109081711222620.pdf
    • http://whdhgs.com/uploads/file/20210910204458993.pdf
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/4a8322c71b8dfe6a57c39a0f17708fed/dimizu.pdf
    • http://arsvet.ru/img/upload/pebad.pdf
    • http://h04ydivan.ru/userfiles/file/32466280277.pdf
    • http://lapawan15.com/shop/fck_file/file/kiviteladonezu.pdf
    • http://dytac.hk/userfiles/woxojizesogefe.pdf
    • https://cosmopolitanhotelbg.lastrada.bg/uploads/wysiwyg/files/45650286579.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd9d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9D 16792 bytes
font_01_sfnt_off0000f5b4.bin
90ac12a1a2efcbcc3ba6a7fd0953c5394d61fdf06386140d8f84e03bcbc5f4ec
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B4 10456 bytes
font_02_sfnt_off00010cf4.bin
0e5584a146c99158ba0f8440e03d0b54e85890cc5adcbb5e5930e34e51c1dada
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF4 18708 bytes