Malicious PDF — malware analysis report

Static analysis result for SHA-256 a36a881c9124b2c9…

MALICIOUS

PDF

100.0 KB Created: 2021-07-03 00:05:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0ba5f382ceb879ad8c8fa69b621fce54 SHA-1: b5e040efdca6dfbf53f04035e0ffb6a20346c669 SHA-256: a36a881c9124b2c997f72e0925423de78e841957ece4d0d3f13a9fed2db54de3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded links, many of which are hosted on compromised WordPress sites or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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 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://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4e5ab0023---44494866635.pdf
    • https://nhatngudongkinh.com/upload/ckupload/files/mozitidijizikutafolelamaz.pdf
    • https://hyundainhapkhau.vn/upload/files/79413269925.pdf
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a73f0ef3d78---25565604042.pdf
    • http://www.anclupnapoli.it/userfiles/file/mibur.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/jbkm2a3j5mi6ocf2hl9uqtmc2e/wetenidaranenuxolajux.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b0115584897---21742864426.pdf
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/448f96d54f1b5fd6bb64ffd8d89d3b44/11473602024.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/58f4d9149b1b28a1892bc58fab096ee8/texudifoponudasupam.pdf
    • http://turagent007.ru/userfiles/file/subojexobovamirematolovat.pdf
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/dml6sh9h53lt5emg77rih1mk0a/47003179398.pdf
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a760c7c16---totokaw.pdf
    • http://fecoil.com/userfiles/file/xiwepoj.pdf
    • http://www.odnpoznan.pl/fotki/file/file/11648691155.pdf
    • http://unseenadventure.com/userfiles/file/38976593596.pdf
    • https://maturana.cl/upload/file/bejiso.pdf
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/657d83049422097d0397af4ab011d61a/fapagefigariva.pdf
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/425rtal659no3h50iqhoei0t0e/wazagamirexiv.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/sgvt7q93f9a60nmgi2mn4hgt46/kakazuloteguxasoveruj.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607357d6c10aa---rugitukibuvomuf.pdf
    • http://trans-serwis.com/userfiles/file/fejoxivosi.pdf
    • https://nestuby.com/userfiles/file/74330475871.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/r3eq2h9a42aamjm4vme8trlr73/39791501465.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160939ea7c7f86---pamelodilikaz.pdf
    • https://33mobility.net/uploads/files/bukakowamev.pdf
    • http://kalkulacka-hypo.cz/userfiles/files/95030525117.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=pmay+physical+progress+report
    • 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_off00012261.bin
c37a0a4fe060aeb605dff3aa29fe0da90ae3d16f2994a231c4c5da68738f66d6
pdf-font-stream PDF embedded font (sfnt) at offset 0x12261 10832 bytes
font_01_sfnt_off00013b6e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B6E 16792 bytes
font_02_sfnt_off00015380.bin
c3a0f87da51ba38a33293b2e627228f82bb4dfb54cd9bdf05e4e52a2eea4639a
pdf-font-stream PDF embedded font (sfnt) at offset 0x15380 18240 bytes