Malicious PDF — malware analysis report

Static analysis result for SHA-256 b953321e1a807b74…

MALICIOUS

PDF

84.9 KB Created: 2021-06-28 08:45:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 73e0b7744c1f97aee440467597ab421f SHA-1: ceb040878a96798b3ee697495eafad1bdbc19bec SHA-256: b953321e1a807b74cb026366f573e5ab30eea5894e12b0323823007ad46452c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious File

The file is a PDF containing numerous external links, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the heuristic firings and URL analysis point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://pixomot.ru/uplcv?utm_term=low+impact+exercises+for+obese
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16095451428d64---nudumukimojufeda.pdf
    • http://on-video.com/movies/movie_data/file/wuwuxazebisojazizasil.pdf
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/74664294873.pdf
    • http://lungtransplantopen.com/clients/d/de/de7cc03d42bda6b8b84c8ac9728529bb/File/79689273802.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a1542254779---66231448783.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/crpu8go6eri4mum0pi59445v2u/51486371693.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/e64874efbac764bc2e4ac731f388890a/31304996459.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/8c1e0166b69f915a6080961e57e3f536/82501041866.pdf
    • https://afayl.com/userfiles/file/fovawumavetadoziberipapod.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da009a1cc0---18807451208.pdf
    • http://happysmilecard.com/uploads/files/nuzazufeneveloxajubebaz.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a07caaeb61e---98971928065.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160816576a3cd0---89264963397.pdf
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4af7d272700e12880e48467787ce5878/78735043476.pdf
    • https://foundryindia.org/userfiles/file/81868233908.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160afda0878afb---gurufusal.pdf
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/52b23fde8fc42a431f594945efe4f404/6017789319.pdf
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160afd6f482381---69185375316.pdf
    • http://kraski-chernila.ru/resources/file/26808218569.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa16eaffac---nutolomiwavivifa.pdf
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/a431bb984df0ca90f849f7e3a74182c8/jatukusevutokole.pdf
    • http://movietek.vn/hinh-anh/files/60531984627.pdf
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/bcfc0c0c72f01c3ccd558bddaf8be425/79005286703.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea43.bin
5ab7627bc6eeba2d13b8862b74d44905954b64af9c478a940566dc48d8ca15c4
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA43 16552 bytes
font_01_sfnt_off0001155c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1155C 16792 bytes
font_02_sfnt_off00012d73.bin
df3cc4eafc028d55d1d858966fb1724252d38b9ad71a4d11ffb465255a068628
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D73 10776 bytes