Malicious PDF — malware analysis report

Static analysis result for SHA-256 512d6a3ecb410bed…

MALICIOUS

PDF

86.3 KB Created: 2021-09-15 20:56:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bba845ebf99121c51927322ddb31cee6 SHA-1: 308b91680e732f7bb2fdfb12211d1f3c5cca834a SHA-256: 512d6a3ecb410beda909c5b9a208e8982d628d74c41d5ffb608a309d38f20573
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution scheme.

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://vibrator4you.cz/UserFiles/File/xonosifet.pdf In PDF document text
    • https://aslimitada.com/userfiles/file/586355667.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161325537132a7---bulamamupelima.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/milagizoguburaru.pdfIn PDF document text
    • http://sakem.org/userfiles/files/wasufopixurakoxiba.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/geroni.pdfIn PDF document text
    • http://halmar.info/userfiles/file/begotik.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210907081802.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/vinenas.pdfIn PDF document text
    • http://nanouklid.cz/upload/file/78921875825.pdfIn PDF document text
    • http://w-w.cn/isee/pfm/cms/uploadfile/fck/file/gumewarolamajob.pdfIn PDF document text
    • http://12shio5.com/contents/files/87398187520.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/97591331293.pdfIn PDF document text
    • https://happy-playground.gr/uploads/_uploads/files/14255878279.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/c26fp5on0n91gkv03p4avjenie/92357561490.pdfIn PDF document text
    • https://www.seblocation.com/ckfinder/userfiles/files/65284481309.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/pg5djqlose9scb365m1gnncsd7/wewugerosexo.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/r5en7uul1fd646pa84s94eieg7/767264940.pdfIn PDF document text
    • http://goodlack.cz/userfiles/file/19089495406.pdfIn PDF document text
    • http://lishasurgical.in/ckeditor/ckfinder/userfiles/files/6716929114.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/doxalizezajowizibule.pdfIn PDF document text
    • http://nhatnamvina.vn/rich_editor/file/2276867245.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b692278d71---52924564254.pdfIn PDF document text
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/topuzeses.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/45713758526.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=put+apps+in+alphabetical+order+androidPDF 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_off0000eb58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB58 18056 bytes
SHA-256: 1fad80e309c177adef451116005c57e0802662beac6f8698b40b9d3451cd8e7f
font_01_sfnt_off00011a47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001325e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1325E 10852 bytes
SHA-256: 316518c4af1cc862f729af12820ce0045e07ee7fe066eca155c6c8abc51d1b69