Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1f9f70cf8bf1f33…

MALICIOUS

PDF

92.4 KB Created: 2021-07-30 03:49:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8e19122e4e481a726a6adc5769f43531 SHA-1: fceea6aecdf568cce88a4b99acb2d306a8a94fec SHA-256: b1f9f70cf8bf1f334685591a380f7c62ee1facaff08fe411f8438a98f21dda4b
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and utilizing disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/6fec77c17fe9ecc3d42be2a9a79c185c/47391277995.pdf In PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/23612279848.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/bb80e1c28e64aff64445b898f47f3f0f/japewu.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/13770975260.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/f84fb7095d18dac3f3ddc0723cdb6731/furoduji.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160873e1c3ab6e---vuxezajibutifidibifena.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/tabuluvapetixunini.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/bvvrv2l0c5otdusltntpntome0/nopus.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/zuxadojuzepej.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/5395969353.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/afksnvb1lo9hsu1nu9qlua8n1a/23982956783.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073f23f36390---33964844974.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085700fa205e---folejorumorakoxezuxoxegej.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8131a6be1---gadojupoziduzotox.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bb6af0018f9---65808631444.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/ziketenowok.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/buf543tcqu45hkcndi70cmqdh2/12968650834.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/nafika.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/tosivezif.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acae1ff1b4f---99213329854.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608e840b2626e---2056324591.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+tell+how+many+cubic+feet+your+refrigerator+isPDF 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_off000103c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C1 17452 bytes
SHA-256: 4569ae2b55d7e31e0e5c30b438c5790a8ab95047f252bbb5d40477f48f4a01fd
font_01_sfnt_off0001310b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1310B 11212 bytes
SHA-256: 0f800ff3aae5c05c49f5b8aae675f78334b88a6e6d97321edf9628164df095ce
font_02_sfnt_off00014b25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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