Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8d5b36ad89f9c61…

MALICIOUS

PDF

83.9 KB Created: 2021-09-01 16:35:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8bdb96807db73c57dba60680388af480 SHA-1: 16d640a2c7c2dc8f69d19885c7a6341b77a12ace SHA-256: e8d5b36ad89f9c61ba700d455f98a783f1194265af28aaa6f114127054c2e2ae
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external links, many hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://laborke.ru/uplcv?utm_term=peg+word+system+example PDF link annotation
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102fb986eb55---40012127301.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/280ffgleb5tet9jtqo0bmb6hl4/83838279064.pdfIn PDF document text
    • https://club-sports.net/uploads/products/files/86358411699.pdfIn PDF document text
    • http://zafirkort.com/uploads/files/49826885991.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/41957633174.pdfIn PDF document text
    • http://allasclub.com/campannas/file/todifukixububapepojepufa.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/mujaxozuwowiz.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072cf3d05591---lejuzazapeledupuwabebofi.pdfIn PDF document text
    • http://danfilenemd.com/clients/67744/File/guzupub.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/sonowaketobemijevowumunik.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/povowefobatosanubameratab.pdfIn PDF document text
    • https://t2sc.me/userfiles/84595052482.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/vavopozefezefozuporopu.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0fbebc106a---30611082418.pdfIn PDF document text
    • http://hopsch.de/uploads/file/liwekiwaketopilaxazopup.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021080209001134.pdfIn PDF document text
    • https://bluetact.com/ckfinder/userfiles/files/68576691273.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/pejovun.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/nanira.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/rorafapumonibovekef.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccea821b4f6---46172385631.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db9a20bc15---bodonuziwot.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/82489158183.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/60134755336.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088b0da6be34---jorubuvafa.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/mutuzo.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_off0000e1c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C7 18356 bytes
SHA-256: 8cf7c9d869499df36c95e65428ecd6208b4425e9ee7bb69d54f7f2da542dc16e
font_01_sfnt_off00011106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11106 10840 bytes
SHA-256: 3cd7d486df9a7616c2d841780933f8d0226c11bdca21597a642bfd0314cdb5a6
font_02_sfnt_off00012a0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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