Malicious PDF — malware analysis report

Static analysis result for SHA-256 a48bcb24f187c672…

MALICIOUS

PDF

88.8 KB Created: 2021-08-19 18:51:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cbfd93b2d292e82f3744b798f2c930f1 SHA-1: 69b9e66706de7f81e85406f208815c3255bdba38 SHA-256: a48bcb24f187c6723f3e60f09b294725bc1f1b6472d4748984c948f3b4c22d99
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised websites, many of which appear to be WordPress installations used for hosting further malicious PDF files. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://wastran.ru/uplcv?utm_term=tarjetas+de+reyes+magos+para+imprimir+gratis
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f638fa25638---wadowusuligirikewevajir.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089793c4ce5f---86216067473.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16096f5bfbde80---nokezitesi.pdf
    • http://hoteldarim.ir/basefile/hoteldarimir/files/goboxusetoged.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f01f961e67---21854372286.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160aef11ee099e---nibevepaxenowutobobasuj.pdf
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/6cdb9fcc6f6dafb93d0a87864440cded/sijoxevakusu.pdf
    • http://jerilyndavisrobison.com/clients/870655/File/23235242731.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ef648e7c1---32711584130.pdf
    • https://kit-veron.my/ckfinder/userfiles/files/zitegofinebajototo.pdf
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c91d5562182---71392425383.pdf
    • https://asiarsolutions.com/userfiles/file/sofukewobakujifeweg.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944861eff0a---24033923743.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16090f284982ab---paxamaro.pdf
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/9f8a672f84e4a2aa25c1d35985439fd4/49947517994.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16072c10cdeacf---6708223600.pdf
    • https://aulacvn.com/upload/fck/file/donusatifowo.pdf
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d3c865126---68917473158.pdf
    • https://golf-tout-terrain.com/publish/page/file/69211816802.pdf
    • https://fablab808.com/nbloom/fckuploads/file/xikamixasuj.pdf
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/mojadufusopivuza.pdf
    • http://crabber81reunion.com/clients/b/b6/b60cf3d631ff247311937b5f15bedc89/File/kakagakebune.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/qmrrcjg9cl08gctn3e0lp83q6l/rejidejuvopazijetudirew.pdf
    • http://www.gonouvellezelande.com/files/narifadafolebo.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_off0000f63a.bin
7274f30775f65398b713ff70518d40f08ad53a5d6d49d644d5e888214b176a6d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF63A 17424 bytes
font_01_sfnt_off00012214.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12214 16792 bytes
font_02_sfnt_off00013a2b.bin
f347687c345322f59e16e405939d79e0aacdf2b2c47d739fc4c391dfbb8111fd
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A2B 10792 bytes