Malicious PDF — malware analysis report

Static analysis result for SHA-256 192aa26f19cea1c6…

MALICIOUS

PDF

83.5 KB Created: 2021-08-27 20:24:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 616db8c33854f8bb2275b94d38d16249 SHA-1: 6d2c67823dd9dc508232ba96c228eb049acc3eed SHA-256: 192aa26f19cea1c69e42c230a00ae6bcf1bdce8820179465836aff94c092405f
156 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users to malicious sites. The PDF structure itself is indicative of a link farm, with many external URIs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://smidgel.ru/uplcv?utm_term=pdf+to+word+large+file+online PDF link annotation
    • https://himalayanthailand.com/image/upload/File/mepajovukumizonegalij.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/d0d648ff81717ebf14f64f743aa9a333/folezemegitewotidewom.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b10f8f2db---59509820130.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/dediromolovejipuzen.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/19098332491.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/408876bb65aa5389d427f26f04b4c3a4/97875843599.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/xubivujagalonudufujuluke.pdfIn PDF document text
    • http://valleypainclinic.org/userfiles/file/lisonapebiselirezufageb.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae51c37b0f6---32734570924.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/vanabemataxidefogitov.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/51dbbffd1c3787ea8926b00f66ed87a9/sedojezikopebituge.pdfIn PDF document text
    • https://termofriz.rs//files/26205688380.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/376f149748e70ae21d820580a62e4787/27891122552.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160854949aa6b8---11435613459.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc19c8b890---fugikujonimapijonigasodu.pdfIn PDF document text
    • https://kfmaccounting.com/webroot/img/content/files/61218409808.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/mumaligikiti.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/witefepa.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/39059380427.pdfIn PDF document text
    • https://austarpharma.com/upload/files/29444135512.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/33963669538.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/6ea9eba2a99294856b2ca51b2bc55722/nivamasulavad.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608a41cd8edf9---degufalube.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/4g28l2m19suphtdbfn9tc2fmvj/53190838413.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073782632a45---sunutibovezejedikemoj.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_off0000e37a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37A 17160 bytes
SHA-256: c242cfd8df171a6e649b81359f9082d27e1e2a5ff9b4061e9f1fa06c88becd3e
font_01_sfnt_off0001102a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1102A 10448 bytes
SHA-256: 3d3af825f30f70c6a59eb0e8cf0fcb7c04f1c44284f4bf8b296e05e1387d87ae
font_02_sfnt_off000127d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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