Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b7aa58ae5c6ff55…

MALICIOUS

PDF

71.6 KB Created: 2021-10-01 02:19:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: fe2cbcaad95a37e1964be9255bcf7a73 SHA-1: 6fc5c900e0cecc9ee6e955df8e8e223469e9e321 SHA-256: 0b7aa58ae5c6ff55e0efe02015eeea916d99610f2bed37eee32e296fd2209b90
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple websites, many of which are hosted on compromised CMS upload storage or disposable domains. This suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://cegled.varosom.hu/userfiles/files/99669172559.pdf In PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/jimil.pdfIn PDF document text
    • http://www.miyadenthai.com/image/upload/File/25801187818.pdfIn PDF document text
    • https://halkum.rs/files/fukopijefiwup.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16144abb4a30b0---1167147014.pdfIn PDF document text
    • https://hoya.mobioptika.hr/UserFiles/file/kurewumutixijolani.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1615001114b137---xoxupatisoge.pdfIn PDF document text
    • https://semangkabiji.com/contents/files/sixumatodefubujefu.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/13270941461.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/vanivub.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/7070276663.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/b60df3b7dc781b9eb8d330125de78195/17573151407.pdfIn PDF document text
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/41587601359.pdfIn PDF document text
    • http://weddingdove.tw/uploads/files/202109221645015034.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/12632055669.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/9334983030.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/15065694852.pdfIn PDF document text
    • https://kildevangen.dk/files/28022097150.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155f8cebd6ec---torekirap.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd60fe58a6---pedowijesarigibowasudog.pdfIn PDF document text
    • http://tuning-zone.eu/userfiles/file/rotawo.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/zezet.pdfIn PDF document text
    • https://dampinggame.com/calisma2/files/uploads/9296846251.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/tuak89rri62ajtfqv30a108ot4/negonot.pdfIn PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/63335572898.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=bloxburg+futuristic+housePDF 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_off0000b55d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB55D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD6F 16468 bytes
SHA-256: d104d65fd5d5c4b8d2b5ea74bbc80c06e58b7dda2aa118315c415ccba14a258b
font_02_sfnt_off0000f787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF787 10744 bytes
SHA-256: 7f019598e6018de72c810d176f27e7d12170fb9ca9ca2560f948109cd0121d6b