Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ba085038b697dd5…

MALICIOUS

PDF

112.1 KB Created: 2021-07-07 03:59:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: d628cf980964135340ab44cf679ee5f6 SHA-1: e9c039ad9525df4a7d037c513c294fe89a04eb52 SHA-256: 5ba085038b697dd56a32820cbdf5d55ea607e9062c8c76d2a941192a984783fb
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to compromised WordPress sites and other disposable hosting, suggesting an attempt to redirect users to malicious content. The document body is unreadable, but the heuristic firings strongly indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/p2qa6gutahepc70eghlppbcv33/94937439095.pdf In PDF document text
    • http://betaempire.com/uploads/userfiles/file/file/50409360405.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/jitasumeza.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/chh3lo5vv9tq3of7lkvutlcv8v/12581635828.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838e71c5e49---roxivebawojilaboseteg.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/gopem.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/33801615339.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/58558352959.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff375c66c2---63170560045.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/q4q1tvog83c6rvn67qtp1rld25/49021049130.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/19cde81841adc264cb3988ea405d2ec5/bazirojagagekawa.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/zudofevuxejafuku.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/05/24/file/20210524_144252_171.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160854c5ba122c---71754398689.pdfIn PDF document text
    • https://soltendance.com/stockages/files/25220045775.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/5fabf58fa755fce4d9ce47ad9209c33e/66349621613.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/85e15b6735e393f35dd432bd31459d01/94229305387.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/99121998338.pdfIn PDF document text
    • https://paperland.bg/uploads/file/wubizimuvegixiluga.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/mawodo.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/8cu5eog2c537jhqaatoeooqhi3/xepadetujoje.pdfIn PDF document text
    • https://www.carrentchiengmai.com/files/gepaxugudoto.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/c1k73fpb5kfl8eusae6r02pp39/wodovorejajoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=questions+to+get+to+know+someone+betterPDF 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_off000154f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154F5 16876 bytes
SHA-256: b23fb537d21c1d92b13d5c2da69f03bdd874922827565c4e906107c5011a31fd
font_01_sfnt_off0001803b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1803B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19852 10720 bytes
SHA-256: 764eb870d205c48a13754266026b6d9404d660d9e1f077c9559244d57c1d8768