Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb1d958f92b5af6a…

MALICIOUS

PDF

87.0 KB Created: 2021-07-19 08:24:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9295d49bcd15ce4ed92c20560267f91e SHA-1: 4b646df6af9decc7dad36ca7c364190699ce9e3f SHA-256: eb1d958f92b5af6a1c1b124a361e15401d4d316b4b7ef2fc5ecd6c9504a134bd
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The presence of a 'Fake invoice / payment lure' heuristic, combined with the ML classifier and ClamAV detection, strongly suggests malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://aterhesseg.com/up_image/file/98448825303.pdf In PDF document text
    • https://autosaloncenter.com/uploads/file/89028715292.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/e0f22a98d1c2585bdaf2297e3345255b/68204983274.pdfIn PDF document text
    • http://azstorestudio.com/uploads/files/dadon.pdfIn PDF document text
    • https://micsys.in/userfiles/file/piwabepotasopeseluf.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/5815884125.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/81960743314.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/jigokaz.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075da6a42e59---29591686741.pdfIn PDF document text
    • https://seerupit.dk/assens/file/2904111860.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/ptpk0d75fjfedsppiub4qf58e0/xosajorom.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8ca711ec19---ledimezu.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/14172632205.pdfIn PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/sijunejujaboluxulezu.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/d061e16937fb260065a3442ae5f2a7fb/41699275132.pdfIn PDF document text
    • http://ebonit.light.bg/includes/libs/ckfinder/userfiles/files/29230730910.pdfIn PDF document text
    • http://iltorg.ru/upload/file/buruviwari.pdfIn PDF document text
    • http://champion-osk.pl/userfiles/file/14463997685.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/durariguwixam.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f690285072---savobikawubozuv.pdfIn PDF document text
    • http://gsoutreach.net/clients/e/ea/ea4f28bd0b090870cbed8536b6d1d406/File/15581540435.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/3a790fa92e57ba3644e36d99b61cd013/pojoxebisozagope.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+long+can+a+male+catheter+stay+inPDF 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_off0000eecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECC 10868 bytes
SHA-256: 293ab3c5b6e379110f557e29c6d5335166a3ce9907aa0b4ed0d0dfa81d213031
font_01_sfnt_off000107c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C4 17364 bytes
SHA-256: 09a80a3bddd4a443362d9dd2d7a2680c8b920d6a1b03bf9d71838dd901675c6b
font_02_sfnt_off00013544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13544 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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