Malicious PDF — malware analysis report

Static analysis result for SHA-256 07988a86e399afae…

MALICIOUS

PDF

73.6 KB Created: 2021-09-04 10:04:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 38e0f1c0976c4c80a7b4751dab94dc8b SHA-1: c0c210de7daf879e0fa6c3329e4b1e855283ecde SHA-256: 07988a86e399afaea824b25dabc897fad7abac0f0c6d5214ae18a6d5231e9461
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm pointing to compromised WordPress upload directories. The presence of numerous unknown URLs suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a9bb9c339c7---falad.pdf In PDF document text
    • http://songhakbbq.com/uploads/files/79478204051.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/ula7apuftbr0vjm19v05ep4mcg/sadusisu.pdfIn PDF document text
    • http://aristosaigonhotel.com/uploads/files/bufenegewunitena.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e94f74009---69568912376.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/161292c13d5cf5---lusiriwoxigidetodabofubo.pdfIn PDF document text
    • http://jdhs77.com/clients/58520/File/43264971962.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/vediduka.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jisavizedokexil.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/0b3d76287fe7980ff4e0e7be81c3782f/89875733821.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d2e0c5f64---tesemewidaniwebe.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/r56s4n3v1sgctqjdne91asu64t/73675913271.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/9sg9oi7b0jl400vt8cfi7a7q6d/wakimarapodesemajevazerel.pdfIn PDF document text
    • https://digireg.li/upload/vakuneju.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/xivajujovajupokuzabufipaf.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/573e73829edc6f18f56102b94cc90d00/gineropo.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210819_130813.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/vukokivuzebebidukosari.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/vofipodazirilafulojawugo.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/615fe7c371e7f61a5314c0c8e2bd1b7b/ratizunelelezajapix.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/goxexolafaduwunawun.pdfIn PDF document text
    • https://bataretak.com/img/files/file/76422341838.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210502082057.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/sosinizomurugokolob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=reactions+of+ketones+and+aldehydes+pdfPDF 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_off0000b86d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB86D 10868 bytes
SHA-256: 33d2d28a4d843ee2b1f255718aec44017618976f1de04f800786d01ca138aa76
font_01_sfnt_off0000d184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD184 18964 bytes
SHA-256: 9a3749c2cef638af019602261a637f408a7c8444fa413c9ab28a3e7a5c89425a
font_02_sfnt_off000100c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1