Malicious PDF — malware analysis report

Static analysis result for SHA-256 7da158036aa0c970…

MALICIOUS

PDF

78.2 KB Created: 2021-09-10 11:59:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 501181fde4fef3a6a6e7e931988e59bb SHA-1: 4c81241eee6bc2bec3e75ca298ff849a719997ad SHA-256: 7da158036aa0c97044bdb97d129b02126a06da36c374945dfbcaf69dc7738389
164 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://novitas.ro/files/49449056205.pdf In PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/161370b44e3612---49082812866.pdfIn PDF document text
    • http://headrepublic.pl/images/files/jexevifumedeba.pdfIn PDF document text
    • http://sinocelltech.com/filespath/files/20210904042556.pdfIn PDF document text
    • https://tl-systems.hu/files/files/26809465187.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///39856145004.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/ruwetip.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021090112481473499.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/wozole.pdfIn PDF document text
    • https://butyfarm.mm520.net/userfiles/files/50374134097.pdfIn PDF document text
    • https://taucaotoccatba.vn/images/news/files/71881274396.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/32301464809.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/lokasudapodigamiwojeke.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/28140847014.pdfIn PDF document text
    • https://dom4m.com/userfiles/files/mupuxut.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613a66c10bb2c---31603266045.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16131723c74f3f---5108556280.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/rimofo.pdfIn PDF document text
    • https://novitas.ro/files/garugenefibap.pdfIn PDF document text
    • https://andhimazhai.com/images/files/nutojubamiraru.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/liwepimopegiporoposipe.pdfIn PDF document text
    • https://onlineadda.net/ckfinder/userfiles/files/jatukaperif.pdfIn PDF document text
    • http://craft-personal.de/userfiles/file/9840078259.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/gevirugil.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/90923385083.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=models+mark+manson+pdf+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_off0000c877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC877 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE089 19360 bytes
SHA-256: cb15899533a455b56b2171f21fd5667e92f2125b6eaf9a1a960fce9b6016fd8b
font_02_sfnt_off00011246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11246 10640 bytes
SHA-256: 0ba02fdca96a60c1c540e287c957fd85b249379907ace3c08f702c097e5c0205

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