Malicious PDF — malware analysis report

Static analysis result for SHA-256 65f700e0bbaa2698…

MALICIOUS

PDF

93.1 KB Created: 2021-10-07 14:31:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1d7e9be08e52f4e84d6c0335d5a357db SHA-1: 58c87f5c74cef6afcf1a7413def1e870bea80f0c SHA-256: 65f700e0bbaa2698cdeac8ef30ddaca067b2989b54bd3753622fa6420ce2b380
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external resources, many of which are hosted on compromised websites or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the heuristic firings point towards a spearphishing attachment designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://newcar-rental.com/uploads/files/202110051946358851.pdf
    • https://alwillislifecenter.org/ckfinder/userfiles/files/gelixekumoniso.pdf
    • http://sartor.ru/upload/files/37189058085.pdf
    • http://vangphutai.com/images/uploads/files/dudupiwefirixo.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/21d87a821d2479df2b1c9d53a672db69/pivoboxa.pdf
    • http://childconnect.com/swi/fckfiles/file/41868712812.pdf
    • http://studiospazioambiente.it/userfiles/files/lasox.pdf
    • http://geredekombiservisi.com/userfiles/file/fegavijukabazat.pdf
    • http://sportingfoundation.com/uploads/file/19491652153.pdf
    • https://gs-hemeringen.de/ablage/userfiles/files/kitebafiwipu.pdf
    • http://asu78.ru/userfiles/file/71127461897.pdf
    • http://ankaser.com/userfiles/file/bowerokumumirapukuratilex.pdf
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/0c56ae28fe30da31f33c18c532981897/13320547324.pdf
    • https://jmbarrenetxea.soinuenea.eus/files/galeria/files/lowuninavenulakiwo.pdf
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16153a2c3f278d---moginaserejoxejudabigosiv.pdf
    • http://peter-scherer.de/userfiles/file/52633055314.pdf
    • http://quantri.thaisonpalacehotel.com/upload/files/30495407447.pdf
    • http://antitumor.org/filespath/files/20210927035819.pdf
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/8268bf65d78f4e6838868e46fbd00b2d/lufetogakemirivopa.pdf
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1bee992b3---10289284914.pdf
    • http://ambulatorioveterinariovianello.eu/userfiles/files/renisajakivisuruvefekobip.pdf
    • http://papaicountrylodge-longstay.com/user_img/files/fokegurisatobuferonefa.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=jre+download+latest+version
    • 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_off00010583.bin
7e4abdb48b0392563f5e1aa63fd0d6cb52f5fe0e1df6fe2c9a910fc22427c9be
pdf-font-stream PDF embedded font (sfnt) at offset 0x10583 18968 bytes
font_01_sfnt_off00013752.bin
9d76a4172302e39731014ba27d47f17668a1d1d67fa69260b30e35bb8cf81b6b
pdf-font-stream PDF embedded font (sfnt) at offset 0x13752 10384 bytes
font_02_sfnt_off00014eff.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14EFF 16792 bytes