Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7b0ec15a6036082…

MALICIOUS

PDF

68.3 KB Created: 2021-09-15 18:47:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 214e7c30f2e4091c85bb316a73e8f547 SHA-1: d643dad9bbe1add800d0b38c242e44b6ba415763 SHA-256: e7b0ec15a6036082cfb69d8c5332b9450c94f40ea377ab94a96980c48d7af815
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its small size, image-only content, and embedded clickable actions. It contains numerous external URIs, many hosted on compromised WordPress sites or disposable domains, suggesting an attempt to redirect users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://oniceh.ru/uplcv?utm_term=subway+surfers+game+download+for+pc+windows+10 PDF link annotation
    • http://srmtteaparty.com/uploads/files/202109120103355436.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/12854704110.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/953569913.pdfIn PDF document text
    • http://demirlermetal.com/resimler/files/bupogorevetijudunate.pdfIn PDF document text
    • https://rawoctane.com/uploads/file/54817260754.pdfIn PDF document text
    • http://baozhaopharma.com/upload/files/fepopadeba.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/53352810123.pdfIn PDF document text
    • http://auroraenergyproject.it/userfiles/files/86451790847.pdfIn PDF document text
    • http://egitara.com/upfiles/files/5158261615.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/tuxuwavus.pdfIn PDF document text
    • https://axlthailand.com/imagexx/files/92777262562.pdfIn PDF document text
    • https://vasutaszeneiskola.hu/ckfinder/userfiles/files/16597849999.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/31164804077.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/325ee93b3a00aaaba2e978f95df34d35/mibaxajewenuro.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/c17bd7646a3a083014f44ecef6782cc3/47277970986.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/88069036250.pdfIn PDF document text
    • http://inkjetartandimage.com/Uploads/file/75444539345.pdfIn PDF document text
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/83999141525.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161332cad4cc9b---71347956894.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/jajivawufefojujedag.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/gawosafutid.pdfIn PDF document text
    • http://cdmvt.cz/sites/default/files/84662939846.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_off0000adab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADAB 11552 bytes
SHA-256: 6438f82e97475aaecda0b6140e4e2ae9bc6441f6ae446dabf3e2af9997c7d3a9
font_01_sfnt_off0000c8b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C8 14096 bytes
SHA-256: 06f80bd480bd6027365270628904c81756e11c80be9a18e5e88764f9ba990884

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