Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1bf0520fc1114e1…

MALICIOUS

PDF

70.9 KB Created: 2021-09-26 13:56:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b19ad7d827719789d96533502f79be8e SHA-1: 70aa53749229ec43440f569d351e2015284b9b11 SHA-256: f1bf0520fc1114e1875e7dda6be12a630fc0e300ad193e46a0fc9f8522c06b21
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs lead to various domains, many of which are likely compromised or malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9d2fc08cd---26821086252.pdf In PDF document text
    • https://alpinashop.bg/files/furajubelipiluz.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/jizotazurivi.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e97f625d0e---17707525644.pdfIn PDF document text
    • http://ituor.ir/basefile/chartermeinfo/files/toworuwerirusademajofib.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614964fc7aea0---2554115619.pdfIn PDF document text
    • http://lachina.cn/upload/file/17799511886.pdfIn PDF document text
    • http://universalgroupautos.com/files/others/92631777558.pdfIn PDF document text
    • http://agro-partner.com/Image/files/vibakanonekut.pdfIn PDF document text
    • http://wsospice.org/uploads/userfiles/file/file/89597785629.pdfIn PDF document text
    • http://owop.challengersports.com/ckfinder/userfiles/files/rokegiziwonixojobebobil.pdfIn PDF document text
    • http://sdes.in/uploads/2497876392.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc2566edc7---94791553961.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210909163046128.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/rawipijefapulumime.pdfIn PDF document text
    • http://auto-rad.pl/userfiles/file/muxofakukopetexaruliwa.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/fevasujep.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/75153617729.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/23978207423.pdfIn PDF document text
    • http://julianina.dk/upload/file/51100118973.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/10335008898.pdfIn PDF document text
    • https://www.tristar-technology.com/ckfinder/userfiles/files/38213863394.pdfIn PDF document text
    • http://hadt.vn/upload/files/mikasimixebuzafifot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=complex+curtain+wall+revitPDF 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_off0000b216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB216 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA2D 10752 bytes
SHA-256: 3089d031d903162ca29b16a404d9d7829a680be249b8337209e9b2901e40e288
font_02_sfnt_off0000e2ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EA 16440 bytes
SHA-256: 5167092abdbfd3cb58ac9ab39464f640d5bf92a2b9924ad16e1eeff16bc722a5