Malicious PDF — malware analysis report

Static analysis result for SHA-256 f21c4ce7003454f3…

MALICIOUS

PDF

120.7 KB Created: 2021-09-04 15:06:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e90e20299aa192ac4294d4ade3b8036e SHA-1: 52c904ff1f33490b571bf1a24dd0aef24bbe8cd8 SHA-256: f21c4ce7003454f35578a594d341aee402510623a0eaf71f480ecc31f796b4d3
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608610b910b77---297487120.pdf In PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c40bf15147---99691273540.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/47kqsvndkek6m0ugc091l4asa5/94576254426.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/cc9450485f7aa593b596505b1edcccd4/ramurixikedekod.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/74859625895.pdfIn PDF document text
    • https://mimpisiluman.com/contents//files/38286726458.pdfIn PDF document text
    • http://xn----dtbhwhggdaoqfh3d.xn--p1ai/media/file/darum.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/92851667058.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/709a253a126e5cc9aab4b29618136975/jawiwugagojuzo.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/sowiroso.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/5ec4cde68a3d6f62701b28fe4378b29f/buxidajune.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b47c150c6f5---mevumajigatu.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/woxejisabimapotixijosemir.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/15278162105.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/magepagarulikeluragobem.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609832ab37211---dawoguxagara.pdfIn PDF document text
    • https://ancoraeducacion.com/images/98322761552.pdfIn PDF document text
    • http://ff-engineering.com/userfiles/files/lenesexudamazufe.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acdfec5f579---ripebedona.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b99b0e6b1b8---vuraxuki.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4f003eeb2---jukad.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/manemufadagereda.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a52ecb3430---18037500771.pdfIn PDF document text
    • http://108homed.com/userfiles/files/42976389622.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/zariborotizizusizazivo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=westeros+map+high+resolution+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_off00017322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17322 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00018b34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B34 18552 bytes
SHA-256: 377853ae95d35db597199d6046042f4978435108f07b7ea96e747937f6b25ffa
font_02_sfnt_off0001bb7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB7E 11036 bytes
SHA-256: f1d15b08226ef67a4d037ed325b67f522521a8a7038ce05c74f0f6069028d77e