Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b4266f574e99b64…

MALICIOUS

PDF

87.8 KB Created: 2021-07-03 07:24:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 1c94e30733d10bbf379816c06c718ccd SHA-1: b76d98a7e8b3ae4cbf445c800878517eefa0a890 SHA-256: 0b4266f574e99b644e5612640a4d56ab84d38c554914a61ce395e2eabc2319b9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. The heuristics indicate the PDF is a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/862bd11e3e2d01815886036845e7abff/72189913323.pdf In PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/88svbgmhovko96ghv77bdb0454/33295055225.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a81fd0a02---75499742214.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080f1f43b44c---63980858418.pdfIn PDF document text
    • https://chp-travel.ir/data/file/basotozosozoj.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/8fa96abea6d83d0ca1e81e3d69ab9322/91444765678.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/df5f2c4ed3655952431bf257aa99713f/96550660313.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608802a4cb43d---tujixibopoximutedurapewav.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ee0a6df82---18463767083.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/vixikorogikapu.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/c13cf0425a3ec96f59b24a584f14c421/sevekakiwegu.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/36662858208.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/9c66d4fcfd19f51fd832f5a1133a5059/70293300534.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/cc9d6f1ba7d91d7d54a933caef68db66/fipitewijixitoxexim.pdfIn PDF document text
    • http://willbramephotography.com/52873074833.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/pdt0a4m5ldirirsci5k4lfcm0h/52143671128.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcc3aca445---88612964432.pdfIn PDF document text
    • http://ibiforstarlight.org/clients/3/3c/3cfcca4e360ca8807b7dd7d6e7cbeae0/File/39953378651.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607051455ac7f---kodefizejezotewirewisi.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073376be764f---retonesufu.pdfIn PDF document text
    • http://axwelindia.com/uploads/kotipinikapizakawe.pdfIn PDF document text
    • http://mrsjamesirvine.com/clients/82887/File/48185587161.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/56137254375.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/79798565259.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=lend+and+borrow+meaningPDF 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_off0000e7d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE8 28752 bytes
SHA-256: 86ac83e34933263d61b0a6a83ba2ec73d7071839792fcd92656f163371332d8e
font_02_sfnt_off0001391d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1391D 10464 bytes
SHA-256: 59a2783eba6fffd2a5112f3754ebbbb28186a24c11ff92c5b5c8ee67386976a2