Malicious PDF — malware analysis report

Static analysis result for SHA-256 df47d3a4f4ffad79…

MALICIOUS

PDF

83.6 KB Created: 2021-09-04 04:44:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 83d940a50d5bc16d090e04d4fd4c3260 SHA-1: 1eb44bc6301f6f1b153a83faf68b7b81acc4e095 SHA-256: df47d3a4f4ffad79b8571f9469aaf5e6c4cf22412c5fc15287b6d37d1c23d2dd
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains numerous external links, many pointing to compromised WordPress upload directories and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external links suggests the PDF is used to redirect users to potentially malicious websites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://drafthe.ru/uplcv?utm_term=number+line+1-20+pdf PDF link annotation
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160aeec7b21285---68079300004.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/nabivuno.pdfIn PDF document text
    • http://k1a.ru/images/files/file/gezajexoranunetogemu.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f2dbde2c74---42042455092.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607731371cb72---89523842502.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084160ddba11---88106192211.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/11601450981.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/2e3b25c6b9cbebb388e023907a771165/27634880077.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc64780d68---nobex.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/xugugitedajurusag.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c880712b5c3---47847347212.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/76218162328.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5e0606bd2---porivej.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a059d5c0959---dudinizok.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/i97g129lab1722ilfkio5doul1/80850251241.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/56106145778.pdfIn PDF document text
    • https://andhimazhai.com/images/files/gizusixas.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/taseditedike.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a1faf26ca---disuku.pdfIn PDF document text
    • http://majesticcaliberenglishlabradors.com/clients/a/a7/a77fae3751d16767b5fd1969bdae34dd/File/gafuvarizirodopalitune.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077549bacd1c.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af7be259ff7---97173992686.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/67731538345.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/cm4bpdt6subtm28vlnr65ddtb7/ranadojelonoxuvitog.pdfIn PDF document text
    • http://sibservis.com/ckfinder/userfiles/files/49747634981.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/31187302315.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a756d05384e---7336646079.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_off0000e101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE101 10656 bytes
SHA-256: 9714eb3ce60f3f6150c126f0555a95c202ed7a1fe36c632b8d4ca9c5f4bf094c
font_01_sfnt_off0000f928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF928 18364 bytes
SHA-256: f1cb0d3cbda728d67e7c153c86e7fb2640a097285f2c45d54a63cf4fd015066b
font_02_sfnt_off00012870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12870 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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