Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bc4da905be69bbd…

MALICIOUS

PDF

77.7 KB Created: 2021-06-29 18:13:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d80b3c22dc1e53bc66cc70ad04ce18f7 SHA-1: ff3e5a3d0bb85ddb6e9a64060147ba08ff9721a1 SHA-256: 4bc4da905be69bbd8d8fd16b69a0154dd35fa902cf00932fd6ff4ffcebbcf507
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress upload directories, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF structure itself are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • 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.
  • 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://coretry.ru/uplcv?utm_term=what+is+manovigyan
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a112d6018---10451210959.pdf
    • http://ildungrice.com/fileupload/fckeditor/file/xugujixop.pdf
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/afb80737adf1f09646ae6c650d9405ac/1474168220.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094f038bbd38---gigozovopebelose.pdf
    • https://electrabicycles.pl/app/webroot/uploads/file/16245413272608.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c16220be88c---18157948898.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a4533c1ae9a---tabaz.pdf
    • http://china-zzld.com/uploadfile/file///2021061107144421.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16080c0927cd3e---7962988602.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/8d53e765a808b6c5e39626090ae6e25a/13282500757.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f74c0b219---43327890437.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/0079bc2e8a60a438c0bbd7aa1feb6750/23548505656.pdf
    • http://bukharajohnscreek.com/sites/default/files/file/495235051.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/cbb19db71cbd9975ba0a438780c069e4/mememijasimux.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16077d5d28f11a---sapezaletove.pdf
    • http://princeworldwide.com/multimedia/userfiles/file/modetorejumenixemilezujag.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096f5050eba3---18184178378.pdf
    • http://amidoux-peintures.com/ckfinder/userfiles/files/pitavirimewibomo.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606da7a6c1914---jigovogisu.pdf
    • http://meechoktoolmart.com/user_img/files/43079038177.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a00f0226599---22025894760.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b79d2d961c5---88924760057.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf90.bin
0fc14b1e98a9576715aa9877e4467db0ba4312c4e59fe68583138250c5996216
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF90 16456 bytes
font_01_sfnt_off0000fa67.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA67 16792 bytes
font_02_sfnt_off0001127e.bin
4a56c40432fe876258a53c03e0e4c003f9ac91636c52518e6a905a20fe99bcc2
pdf-font-stream PDF embedded font (sfnt) at offset 0x1127E 10452 bytes