Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfcf83dcf25fb3c6…

MALICIOUS

PDF

73.5 KB Created: 2021-09-03 02:54:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6bb634686e2dedf319134bc2f6405b5d SHA-1: 2d65923e85195c268f9dac386e97dafc1baed2c9 SHA-256: cfcf83dcf25fb3c6d13b2d62efc02bc97ce7bec1319faa4f88cc982453d39d18
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. It contains embedded JavaScript and functions as a link farm, directing users to numerous external URLs, many hosted on compromised CMS platforms. These links likely lead to phishing pages or further malware downloads, consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://krisoc.ru/uplcv?utm_term=dibrugarh+university+bsc+botany+syllabus+pdf PDF link annotation
    • https://cakenflowersonline.com/userfiles/file/bigutelasurapinolajad.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/64223808261.pdfIn PDF document text
    • https://nada70.org/userfiles/file/vetuwobobunox.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccd3f98d3b---42266829785.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/80740490025.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/84441462425.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a36431543c4---bafidivujivixidapaw.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae90fb787d---38338802487.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4495a6a16---lawixigutama.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af9c252be26---32383685625.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719effe68b1---941161898.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/26149336040.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffacf08b32---64041668086.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/53774057575.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/xilifujuja.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/87543302916.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b54a7ca967---pefagivuwawirumina.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607beaa9aab2b---59147152393.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d99031bd6f---64908449744.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd01a7d66e---vilupoxipimusi.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/34605459868.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/xuvafifaxak.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/4022889180.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/lixogew.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_off0000bce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F9 15960 bytes
SHA-256: d5ef2bc8355e15f79908db95d9c549f5f164bcf3845dff12466eaadd251496f1
font_02_sfnt_off0000fdc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC6 11320 bytes
SHA-256: feb686a41a4cbc2146f26b393c443b6e247eac06a5fe6784f1fc84ccee987deb

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