Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f5e02d4edcb8251…

MALICIOUS

PDF

88.7 KB Created: 2021-07-09 12:38:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e29f77a4c1852d05d04254eff48eb2a8 SHA-1: 469ab1ffe6ef9845d0942920d764c9d17e80a1e1 SHA-256: 8f5e02d4edcb8251dc68b2bba6c32e6d0cfa11b4afe63f911a2fcb651b275494
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160beb000bc467---21800741461.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd2909ba84---1903684303.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e4ef99fc2---vosixutozowuwudekujaduvad.pdf
    • http://gtlmarinefuel.com/userfiles/file/magafikezutixabana.pdf
    • http://vankouwenenmastop.nl/UserFiles/file/75644263061.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/cdcbd11b875559bea3acc772ee0714f7/62497377995.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d26359349de---guvasekux.pdf
    • https://avigailpekelman.com/sites/default/files/file/76384805825.pdf
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/famefipudefopomazipezo.pdf
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1d35457e3---46987679863.pdf
    • http://magnachip.cn/userfiles/file/20210519153329.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/6e77a466bd3ecff5583624492b376e81/21361011088.pdf
    • http://mim2010.ru/userfiles/file/sivujaduxotebag.pdf
    • http://grandchainfamilyfoundation.com/clients/85333/File/43896807487.pdf
    • https://itacademyindia.com/ckfinder/userfiles/files/82686342591.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160b3f66fc9876---tukitavofom.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/1lt1k5aerd688ia3hvj26hr4a3/niruvofagu.pdf
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1398e85c9---38361997144.pdf
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/d73f75d289c17aecdc535dfa186aac5c/82820944994.pdf
    • http://sl-light.ru/design/img/upload/file/riradakevisovoro.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16088fb4d1f7fb---29473960177.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160982a4d1c04d---21282245283.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/8de6948ad9f9fa268624cac0695c0682/7824699933.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=8.2+hectares+to+acres
    • 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_off0000f926.bin
a7e9fb6d83828077bc9a3da5958d2728b97595e7fb1314db1b30ea065ca1e49d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF926 17056 bytes
font_01_sfnt_off000125dc.bin
cc6064216d7a596383bfcd419f1ec30c666253a48f7dea0d0a3a8a58dea59ea1
pdf-font-stream PDF embedded font (sfnt) at offset 0x125DC 10380 bytes
font_02_sfnt_off00013d93.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D93 16792 bytes