Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7b527ea38a230c8…

MALICIOUS

PDF

81.2 KB Created: 2021-09-19 04:15:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ab5737ad2ad772b7d18ae1ef76878466 SHA-1: b36529ca939a1c1dfa99c3ac0fec736ee46e6a9a SHA-256: e7b527ea38a230c8de70ef50b9dd7f7880751c2cbbe652e2c6157cad8c5eb7f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised WordPress uploads and other disposable hosting, suggesting a link farm designed to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to manipulate search engine results for malicious purposes. While no scripts were explicitly extracted, the nature of the embedded URLs and the PDF structure strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • 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.
  • 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://crysiq.ru/uplcv?utm_term=advantages+and+disadvantages+of+interviews+in+qualitative+research+pdf PDF link annotation
    • https://theurbanthinktank.com/files/40193019962.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161434cf82d596---56086916628.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/gijidemaxuweka.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161455742824a0---tunamosupafikawiko.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-09-19/images/files/lenirotodudofujewedu.pdfIn PDF document text
    • https://codecs.ro/images/file/65633013124.pdfIn PDF document text
    • http://bamboomfi.com/htdocs/cljr/data/files/17355741950.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/tagisikuxogikotutir.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/wevuwerekixatufebibogibi.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/98721806673.pdfIn PDF document text
    • https://bczenekar.hu/files/file/lenojixumubofaruvejupizig.pdfIn PDF document text
    • http://pate4me.com/userfiles/file/kinufusokujozoto.pdfIn PDF document text
    • http://juncheng.tw/upload/files/bezuvowabugolijuxoni.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///92436279874.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/vewuxubajujigidotit.pdfIn PDF document text
    • http://icareonline.net.au/ckfinder/icare/files/vurusu.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/n77daf4j3eg7fpmq860ruhcf6b/26529644545.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/39307318087.pdfIn PDF document text
    • https://nhahangbienhaitien.com/uploads/files/lemelufevujopegitoro.pdfIn PDF document text
    • https://jagamimpi.info/contents/files/falipabugutimebavom.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/lbeaut5ioaghr31ejup63d8stq/56786533165.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/rafinibipukuzi.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/mitiperuxanevanupi.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/a384458289bef2126935f12d6cbfb772/73828168277.pdfIn PDF document text
    • http://mexxeopaint.com/upload/files/46840680207.pdfIn PDF document text
    • 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_off0000d9eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EB 16604 bytes
SHA-256: 815eca47e329f3976aec632fa7e21f7ef5a158fee72d08dff11a580020256207
font_01_sfnt_off0001045f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045F 11280 bytes
SHA-256: 90c0a760d788a08198681bb4e730f6246bdabf1b9f1a1bf58c7ae35eac75342d
font_02_sfnt_off00011e6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.