Malicious PDF — malware analysis report

Static analysis result for SHA-256 18aa07741e6dd16f…

MALICIOUS

PDF

88.6 KB Created: 2021-09-01 16:31:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a2c3364148d997376093c81fe1b6d12b SHA-1: 0888fa009b3d09963583a4597b6db7c972aa95c8 SHA-256: 18aa07741e6dd16fea6797ee3b7f306cb53b4e0edc6321c41d0900a08f420924
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories and disposable hosting domains, indicative of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://opuspoint.com/ckfinder/userfiles/files/57955433197.pdf In PDF document text
    • http://innersolutions-uk.com/file/pisubavevupid.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612cfdb6048ce---63472265664.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/5be7e41d6388283ac964ac639cf4c653/3581548134.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/11000514295.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/7213808203.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/27645930430.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/dsjsop4f8j82h0elohhdnce1h3/33600372396.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/9dir3kobg173g6jo20r3it42s3/38810288725.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/780fd0163b16459b34fa57be45a97195/73868346498.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a2bd1c788---51481742215.pdfIn PDF document text
    • http://s2group.pl/userfiles/file/jarojokavulonawexemotovop.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e1c2b493b---bepifixasutelum.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b46b586d52b---93552835795.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/16746372823.pdfIn PDF document text
    • http://boschvietnam.com/files/usersfiles/files/zoxixagawexazimebijuwerut.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bad92d75c03---vagidumadokobajelugegaw.pdfIn PDF document text
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/sasgg41ee00t7bj0980crj9d6i/tibiwimagipujafujisi.pdfIn PDF document text
    • http://skkl.cn/filespath/files/20210822024219.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/iuqhlu29hqtscbse6hatebm224/25259601353.pdfIn PDF document text
    • http://mistralizmiryonetim.com/uploads/file/zarezogiba.pdfIn PDF document text
    • https://www.paseppe.gr/ckfinder/userfiles/files/mubirazusibibuvununoki.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/kiwuvazov.pdfIn PDF document text
    • https://ctapigroup3.com/contents//files/40786176495.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=spend+a+penny+meaningPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EE 22116 bytes
SHA-256: d0420c59eef836ddfc0d743a4be6220993f15b9c82ae8e8aaa69fb0225b397af
font_02_sfnt_off00011cec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CEC 1820 bytes
SHA-256: ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c
font_03_sfnt_off00012577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12577 10392 bytes
SHA-256: a8ff7004b61a41e62de5789886d96fb4555a8b3be2325ae4aa3837659bb3d0ba
font_04_sfnt_off00013cb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CB8 16064 bytes
SHA-256: f76835efc0f70b52b211676925d3c3919e6952eec6cd10f320d1ab287c5fabf2

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