Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1b01b9552506dd6…

MALICIOUS

PDF

83.1 KB Created: 2021-07-07 10:19:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8d278c2cd3cf68b666db8738506480ff SHA-1: 743ee8e1efad7eea2f6aeb3e7909a3dc626707b8 SHA-256: f1b01b9552506dd6841b5fb264ca1c5d80c75c0e6840f580536969ab945b1518
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of multiple external links points towards an attempt to lead the user to a secondary malicious resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/db6a0b70b364fbea768a2e5d2680c99c/potitamiradiwifojeki.pdf
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607262a99a6b8---surojezirefofuredugide.pdf
    • http://www.advokat.com/app/webroot/img/fck/file/dumadim.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c98f026ee79---pokoxovedesijivarolobowa.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2d481fba6---29152158157.pdf
    • http://remont-etalon.ru/upload/files/60033719337.pdf
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/4e0fa29e267fec5db4598bafd58b1f5d/47070167423.pdf
    • http://akcjonariusz.com/UserFiles/file/50723018605.pdf
    • http://smartvoicecom.com/userfiles/birajewareb.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8d7bb8aed---65770967322.pdf
    • http://exantusfamilyreunion.com/clients/9/96/968554593547eb574606130639276270/File/3282714585.pdf
    • http://etabetasurvey.com/userfiles/files/48132001707.pdf
    • http://artistalexanderkanevskywinnerinternationalaward.com/clientMedia/file/22666168162.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/7rf0mrc9ctr7fcsv9461lrg18c/fefefewonevi.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/v4bb93gljoqtnr2udmj99r4b1s/73469672985.pdf
    • http://fitviewer.de/files/file/fudaxewujukatapejozuvag.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c81b867c4---70057073842.pdf
    • http://anhbanglaw.com/userfiles/file/20706392647.pdf
    • http://kryotherapie.net/neu/userfiles/file/19577257896.pdf
    • http://vinmexindia.com/uploads/tejewa.pdf
    • https://diedacorporation.net/freesiafiles/file/bojixusete.pdf
    • http://rauvuonsach.com/images/uploads/files/35415675731.pdf
    • https://debcopharma.com/userfiles/file/fasidisejig.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8d75cc9b5---rulanesesepakose.pdf
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f4a8c0d5c---11085797305.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=find+rational+number+between+2+and+3
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9b1.bin
d658fb65a988736283914555be939b88e931f9919ba3333f286d024c4bc02cc2
pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B1 10836 bytes
font_01_sfnt_off0000e2b6.bin
ef34b7cd72a93d8168200b981a3b57f0166a645db9a4a7e7b0d7a4523452460e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B6 17320 bytes
font_02_sfnt_off0001105d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1105D 16792 bytes
font_03_sfnt_off0001286e.bin
5cd8a120e106fc2d4fc1855603a636a3ce922decfb1b4d98f17a4a5450337c58
pdf-font-stream PDF embedded font (sfnt) at offset 0x1286E 16344 bytes