Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9c6e449f682457d…

MALICIOUS

PDF

79.8 KB Created: 2021-06-28 22:20:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 62a4cd4e0e5414fb3554bcc286483b93 SHA-1: b3f4a4595fb228114ef08ef5d30a260653795a68 SHA-256: a9c6e449f682457da43352af00333c8426e8fee97fe4116cbab4c58266f7a3d8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. It also features numerous links pointing to compromised WordPress upload directories, indicating a link farm designed to obscure the final destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • 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.
  • 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 http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/2c454fe601e28ff89ad21eadfae6c8c3/totovuwomubozazefaxavaf.pdf In PDF document text
    • http://absolutelyneon.com/userfiles/file/xebojorurojerigukid.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/geduwofetirusepiwonavepu.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/c4218b9eeef9e29fa9cb2208af731669/8814442535.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/eaphg345qt0q7lvjpupnfd84ho/lanimamep.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/fotibusagaxojisorib.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd8d9025ed---vakiwedusebur.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c643bb58a---sokexot.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/77774124647.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/71599354038.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/ljbmdak59pakgecbv79fgpg046/veromexeruboduf.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/60427075355.pdfIn PDF document text
    • https://coffeetuanvang.com/Images_upload/files/2267267915.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/50905617933.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/45209479151.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/13e50dd02667cd60e41b440f3007aeb9/28719659927.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/5e08e1318228f9d4053d94b862d19c8e/25249584711.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3fd79118f---mopapukinaz.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160714624c871c---wonizegaf.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084983c13d85---93604766067.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/xatizasumumezudepab.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d2a9bf59b1d---lojojelotuvepilujomowezaw.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/12201b6784a24985fb2c18bf1cb3543f/tobaf.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe69534616---70618600713.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0eb672b6cc---xodifisiretabafidisoferak.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160765e1bdb5a5---zadoxudetebozitol.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/xumipifareretegaj.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/sitotugubolalejugi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=i+better+than+youPDF 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_off0000d416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD416 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2D 10204 bytes
SHA-256: 75375da89660ec186fc26514ae966914245f0a25538bc26df194ad914ee2092a
font_02_sfnt_off000102ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FF 17948 bytes
SHA-256: d7278dafe6f7e5e96ac7c6068ee932b5240af3b897228166048ae604d22a602e