Malicious PDF — malware analysis report

Static analysis result for SHA-256 8715594f283f26c1…

MALICIOUS

PDF

78.5 KB Created: 2021-07-29 14:09:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 07e0f133b4fcdfb212eede02f704ee30 SHA-1: 5e1a09d77f52a893acc8d77d6cbc7ff1606879db SHA-256: 8715594f283f26c1732dd107c1c8fd8239f1c21d63b82b39e32141abb49b943a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple distinct hosts, many of which are associated with compromised CMS uploads or disposable hosting. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly suggests the document's purpose is to distribute malicious links, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://acpiindia.com/userfiles/file/zejakub.pdf In PDF document text
    • https://catbasailing.com/upload/fck/file/gidizetoxibe.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/904624f791ca698929c40359b1d1a26f/7354137767.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7bke51lflmqld0trdov3j4goa6/zefakejafabalodomib.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/93822150878.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/cceb41f052e690ed6656a3b7e5bd23cb/sawuburakomebaz.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/taxerupuxodapevidewu.pdfIn PDF document text
    • http://xtra360.net/campannas/file/tefabujisisikawojoferi.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/vizotuditupoxuduzinajanof.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/siparatitepuluwefug.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/fetaratuf.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1b3d23d71b---fokuked.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/5e72fac3dba5a4b134554894762f961f/xobejagavun.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/c41e70c9fd337d9e6ceaf08a013f245c/futimusamotitatozige.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/71350800078.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc55fb03fc---lurajufinot.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/28126939880.pdfIn PDF document text
    • http://www.rannatennis.ee/data/upfiles/files/74664772324.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/lasixutozuwoli.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b01c5bcb106---18844819589.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1f8cea4ab---pasujepuxufazuke.pdfIn PDF document text
    • https://warungmimpishio2.com/contents//files/tovesoxopujivabupatozo.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cc93c776ad7---neluruzuxofukuzerop.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f80f3dd9e---lovag.pdfIn PDF document text
    • https://bor-diing.com/upload/files/72899156493.pdfIn PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/jafowidalubujitaxonozi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=shane+eagle+cutting+corners+mo3+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://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_off0000cca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B3 17308 bytes
SHA-256: d25a30810f6e6c254d25415827da5d6c963ef420971f6f5c783a258d1d02ca0c
font_02_sfnt_off00011217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11217 11252 bytes
SHA-256: bf9ae020c671a9250f18d2c192511fa7a9069a9c38e5f9164f76e6abbf5233e7

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