Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e6190a4dd53560a…

MALICIOUS

PDF

133.0 KB Created: 2021-06-28 01:58:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: be66af1ce5af109909c95c037ea8f03e SHA-1: b13357ef48139a21efe2d27df0505b1bedf8e95f SHA-256: 3e6190a4dd53560a74b5967d722b48bbdbb819cc0cde714818fcafe3e034f4ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, which act as a link farm. These URLs likely redirect to phishing pages or download further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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://crysiq.ru/uplcv?utm_term=underachieving+gifted+students PDF link annotation
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/572ac7ad07e7c93dcf0d0cfa44cc4306/gogapowasakovun.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/f635bc733f784d6d547bc75a5d860ed1/96947764682.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160983fccf3e36---38900449699.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3eddb8c3d---84380634204.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/nijajomaretonulorax.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/8mflmvfrf840ibgoikquj0o097/31731851150.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/77943692512.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/9e37d6f6acad660534bc3b0b45f4d5f9/7871588539.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/tadovovujidotakuvolow.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/66dcb7b2c34a8facb5b0bef696b68934/49052705892.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/tavepizagapolu.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/54683024824.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed0bba1bd4---tunafobawosusul.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/kuvofinar.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160786b3e34421.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1b3bacf03---zajoteberiga.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/jujem.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/wojidodonir.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///95766212957.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/f1e220857ad1e5b51559764cb563ae0c/dozuxizidaxumedojokakisuj.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/c4a6ab35840f43bdaba0879d437d540d/67620260113.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/3d3148756bef5e9ed6130d93092a5520/lazidavulirisepimub.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_off0001a518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A518 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001bd2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BD2F 10760 bytes
SHA-256: 4ba115422c15aad65e5ce5d4a0e4b01a458b8c4fa4055c993ca5445cb21feb04
font_02_sfnt_off0001d5ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D5AC 18824 bytes
SHA-256: cde4bc9d1064e3672e3ac8b3b235ddd2cc28e8bf89aa88b8dbd6c58acc6f997f

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