Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ec0a29bc1c46a66…

MALICIOUS

PDF

90.8 KB Created: 2021-06-28 08:29:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fdc7f97b87e3f5b64441bad3cda475eb SHA-1: f4ae82bb25144c9b432c86806ba4e60ad104b7b2 SHA-256: 6ec0a29bc1c46a665be09c63e351a292a69f92cc9d70dbf06ccd08c04bfb4331
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised websites and potentially malicious PDF files hosted on these sites. The presence of numerous external URIs and link farm heuristics strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/ae2cc45298db33e0181f8965515b7433/buxadijumerifoxisij.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160865ba16c24d---48909499383.pdf
    • http://c-amc.com/upload/files/95773007819.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b801af37e6e.pdf
    • http://top1np.com/ckfinder/userfiles/files/68876525574.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160cc965535d94---tupuzenusam.pdf
    • https://nnt52.ru/userfiles/file/37617104275.pdf
    • https://acronimocostanzo.com/userfiles/file/14858989436.pdf
    • http://enricobarraco.com/files/lakap.pdf
    • https://kp-bs.ru/upload/files/90030122826.pdf
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/g5tpgtvij0aqdffh0ssg05h4hf/4481917299.pdf
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/309b8954877ac0230f05aa6bcbf01294/sikosalurewizeje.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/2ba055355547e292e2e9d59b9af344ac/62052683858.pdf
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16070230e580ac---sonifow.pdf
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/d01202201940010d91854ee2e581373a/kasisapusiw.pdf
    • http://wongkungfu.ca/clients/f/f5/f5c316b966f29b3192b3e9e3c5714b3c/File/dobuzijefu.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3fee2ee39e---56953142564.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe7d436b77---82313472868.pdf
    • http://wintec-samu.hu/uploads/files/34276911982.pdf
    • http://atomleasing.ru/media/File/memovupitenigupomakamis.pdf
    • http://hoshitorionline.com/uploads/files/pemozowajawoka.pdf
    • https://aduanaldelvalle.com/userfiles/file/1279338436.pdf
    • https://africanresearchcenter.com/userfiles/file/95143105327.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c0027e96b---vavozosawepibep.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/845637b2fbdd37e798f39919016fd6b7/buwizunulaju.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/vro0n57d3l95o6n2f99mdve9qh/pusanuninar.pdf
    • https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/ab930ae40dba838c0f42c7a4a80c08fb/wetifufidon.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=be+stable+meaning
    • 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_off0000f6b4.bin
2ac09aa8f3d86ee85d1726824852323c4052b3914a0f5515435377ca07e4fa0a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B4 22232 bytes
font_01_sfnt_off00012e38.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E38 16792 bytes
font_02_sfnt_off0001464f.bin
9172d4eae9ef140fae46e83ab8c099982d61aa7a6cc0a703504526338135c952
pdf-font-stream PDF embedded font (sfnt) at offset 0x1464F 10424 bytes