Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef1de5fac7d17d53…

MALICIOUS

PDF

101.9 KB Created: 2021-06-23 22:53:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 6437a0b06618eafe5731d966b7b621f4 SHA-1: 6461ced0131b73c924592e3ca33d36865c83283a SHA-256: ef1de5fac7d17d539bcbaf2176fb55797d9e4619bfaba0da7632a5fbd94a6fd9
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/a19782e53bf19a3472e0ca7599a483c4/xapizuraku.pdf In PDF document text
    • http://atdawnwelift.com/userfiles/file/gedot.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/42b27ebfb3c63c3a53e827a08a586546/pelefepuzekunil.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/m01mmjnc2n1mqo26s8ej1613oe/vujazexosaxuvopuviro.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf3d8019337---52262843742.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/9c7cb85aafcfcd85fbba752f2b08491e/xasubogibar.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/2902fdfb4076c4ee6f10edadc4dee448/2914838765.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/wunotulivaxufetasiluleg.pdfIn PDF document text
    • http://127.0.0.1/kardelenemlak/upload/files/nudedevige.pdfPDF link annotation
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/cjrjdcvbl6s18pjomf8ifg6u1b/samen.pdfIn PDF document text
    • http://ylphs.com/ckfinder/userfiles/files/46813329365.pdfIn PDF document text
    • https://chaplains-camps.org/upload_picture/file/89065231338.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/dfa23e87f5a299a92465b36d8437787a/kubajapesuxasesizazopibi.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817266a5b49---lenamojilul.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/70842842406.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/7b6509c4ad7d622e0c515dca11aebd00/mepusurotifo.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/24138872066.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=trikonmiti+formula+pdf+downloadPDF 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://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11360 5112 bytes
SHA-256: 9144c2bcc8c5c7f120458d4f718ed2bcb7d164525187f117190f8fed419a1e9a
font_01_sfnt_off000124c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C3 3720 bytes
SHA-256: d0c9e33916e9e64e42e31bcf0d345f6c2fcd41735b1a34df0119bd0eb1094281
font_02_sfnt_off00013027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13027 11288 bytes
SHA-256: 66d708eebdca77e0d9b0df527c1e4672c627f22088e60881eadb9fb647840c0b
font_03_sfnt_off000156e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156E6 17512 bytes
SHA-256: 8d4650bfdeb9eb557400915ded6824bbfefde1d8d3b084bfb88b4dc11fb18e6c