Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c9fb48efa34b443…

MALICIOUS

PDF

119.7 KB Created: 2021-07-01 23:53:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3c4a035b8499df761ff215419b88b1a6 SHA-1: 32b0a88c671afe254a17a8f31685d189c7c0fe1e SHA-256: 9c9fb48efa34b443001d5d8d71845716461068e7b21ab4cd2ee9998818475838
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised CMS upload storage and disposable hosting, indicative of a link farm used for malicious redirection. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. While no scripts were directly extracted, the heuristic firings strongly suggest the PDF's purpose is to lure users through these links, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://angelsstaff.com/uploads/file/71219340804.pdf
    • http://aweibel.com/Photo/file/fetijuwima.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9c3a700cb---61081402114.pdf
    • http://anhuizhkj.com/upload_fck/file/2021-6-21/20210621043709345219.pdf
    • https://raptiherbal.com/ckfinder/userfiles/files/xizunupijad.pdf
    • https://dbmotorbrokers.com/userfiles/file/sopuvasa.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/3cc74fe39ccf564dd784ef90b49f6050/75304354445.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b35cd8ccdd1---79279690934.pdf
    • https://martensmgt.com/business_school/uploads/file/rewomonoja.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608237b873f28---71241689640.pdf
    • http://wo-kop.pl/userfiles/file/13341390433.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080231680800---zupamujafu.pdf
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607c343695153---posugiwotora.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/667c5419bb7d28e5bcfdacecbf2f0cd5/64659747459.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096e61b0dbe4---99175209503.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4903e7511---degiporudedogibexab.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c180afac0fd---zupupusosonudopebedipeg.pdf
    • http://aftckwt.com/uploads/file/kubozuler.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/cvepnvj60mcroaicveojj04rgj/sinedujowejewitol.pdf
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/1848894ee19ac5f02dfdfb235657a321/48613879224.pdf
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/1171291b100397e246374a9e8734bdee/gozuwova.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/d0187ad4d2cb25d2a0bbeeface473b76/98600687401.pdf
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/129c74dc1c87f1c6a6a97aba41bb5afd/39178790322.pdf
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/c5b2478e54d2120087b4d792b7fc0ae8/bojuliresube.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=swtor+shadow+of+revan+how+to+start
    • 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_off00016fd9.bin
50afcfeb876963260f0619cd87490f481c5034a84e823e2fc1a45f8c3f2b48df
pdf-font-stream PDF embedded font (sfnt) at offset 0x16FD9 18656 bytes
font_01_sfnt_off0001a15c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A15C 16792 bytes
font_02_sfnt_off0001b973.bin
d108c562698aad9cf745e2b7a3182e8c556768f9fcc3acbcda5eb94c2f243ef7
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B973 10540 bytes