Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebd0e79eb79c7a03…

MALICIOUS

PDF

105.7 KB Created: 2021-09-04 04:47:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 662ac190fb60077d32e6d97109d3c551 SHA-1: dd521fac506a0a85c782a4c70d4fc2f1b7c43c0e SHA-256: ebd0e79eb79c7a03570a50d6b5da8452228f6b3a86892b0db5fcb9eef1707a47
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, 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 directly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://nomylo.ru/uplcv?utm_term=plant+structure+and+adaptation+worksheet+answers PDF link annotation
    • http://architettoangeli.it/userfiles/files/93422849723.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/5f1d3bc9bd24c859c15695e978e3280e/vugebokejovovodezaruwul.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/c59aa5bc99dc43c7b6729b25edffd550/nazufirer.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/p05fk3hv0ccr3e2ejske5skdh6/56698857901.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/11258798058.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/43a2e1caa5a3718e13b21d38fd45bae0/11613410100.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/labutagefejazex.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16120fce9b5a7b---ropilifidopolusov.pdfIn PDF document text
    • http://lucidareemantenerepavimentifaidate.it/userfiles/files/70256813047.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/47203582937.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/pofamapi.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/4224f796343746cdd33733cd5bd9405d/bobawunolakido.pdfIn PDF document text
    • http://nuocmambason.com/upload/fckimagesfile/a8f6e5207f38c73deb431481b85e1e5a.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/99778702170.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/f35efdc554581932131e4f1510ef1968/suwodotogatubidagid.pdfIn PDF document text
    • http://studiofelician.com/userfiles/files/88420487699.pdfIn PDF document text
    • https://sjalikave.hu/pictures/file/16895563090.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/ginagosobazipe.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a717e7e7f51---93932606631.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0552503a01---semurezudesogumivusoz.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123a14c4417c---24886920879.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612972ee2fbb8---51230532315.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16114765f8c0b1---dubujanujegamebobusum.pdfIn PDF document text
    • 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_off00013a9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A9B 10888 bytes
SHA-256: d9c37bc3e8156288e2ee0c3da24c20b881b08b951a67481bea88cd2fd2083236
font_01_sfnt_off000153d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016be4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BE4 17400 bytes
SHA-256: 38e23a1a4f54c0512c85925790c7d1288437619f05d56378f7d18fb2611cb0ad

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