Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e1dc071d3e5a70e…

MALICIOUS

PDF

83.6 KB Created: 2021-07-14 08:06:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 912e4a4b00fdaaee979dd9d1beee39da SHA-1: bbb0b0ca0f7fdb6c2f19b793d521552ffc6bf8ea SHA-256: 9e1dc071d3e5a70eb0a34a56ffd6bd8b682e1306925b739d0df6e92259c23893
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware distribution through these links. The document body is unreadable, but the heuristic firings confirm the link farm nature of the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2b49b43c1ef908825b6e379e4232e6a8/pufibenewegigoserulomat.pdf In PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/31021787005.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/narivinajefawufafil.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/narodasijabeloxavowenapu.pdfIn PDF document text
    • http://gardnersunited.com/clients/e/eb/eb3320446930dd457027df34457c622b/File/setivasofakatedaxov.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/56277146052.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/89977753900.pdfIn PDF document text
    • https://666666.vn/upload/fck/file/6144352446.pdfIn PDF document text
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/em77uqc7ltc9rp2h0l2ct458us/fetugo.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/jowom.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a95bcd3430c---womitamodupofisabowenuxib.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/af4ade378d39e8957e0417348442dcb1/35974779993.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf6866abab---87838891096.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/bijibumerawas.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e53e4a31e---jepexoreginudowi.pdfIn PDF document text
    • https://noventa.cz/media/files/file/wulaxuzumepobivel.pdfIn PDF document text
    • https://hanul-muresenilor.com/wp-content/plugins/super-forms/uploads/php/files/9i2ib01t4eodioore0shl00qtp/67973204220.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160769ccbc4404---mikifijabepojuxules.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/455e0ca21fde27970e5a730b226d4aec/wiforuwixafeb.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/zopegipa.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/2ad8ijgg4vdhvnol6dn5ebev68/pugusazabege.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/28d0024e84ffe24282dd54a57cc23ba9/34931453830.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=pop+slots+free+coinsPDF 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_off0000e74d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74D 10312 bytes
SHA-256: a06d93b566b7d611fe17330fcb0383bcb0ca78ba8d59bac81232a4e99cfc6f57
font_01_sfnt_off0000fead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116BF 16444 bytes
SHA-256: d241a4ca482e8139ba8b20be170cfebb866617ce41b760e324cc83f8b92e80e5