Malicious PDF — malware analysis report

Static analysis result for SHA-256 aad72a7bc45c2610…

MALICIOUS

PDF

75.2 KB Created: 2021-08-24 23:22:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3e7406e0a4e003aebbe64f317f965f0e SHA-1: d961d9088ad3ccf80be101f8e3b27107b6ab583e SHA-256: aad72a7bc45c2610b5b90cb7fd1bf2a629632d37caf1467a5763e306d400f118
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the heuristic firings and URL analysis point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://kurek-rowery.pl/user_pict/file/dafinoraz.pdf In PDF document text
    • http://angelescare.com/userfiles/file/nagononarurijiji.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160923cc973ba1---6988083497.pdfIn PDF document text
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/2d9ea58871c278e2a445d11c44e6fa21/lisozusuwusabix.pdfIn PDF document text
    • http://phsclassof1970.com/clients/875774/File/pawofurorefavujize.pdfIn PDF document text
    • http://vhktn.at/images/content/files/matewufakugalidagusik.pdfIn PDF document text
    • http://clubcrudupsonoma.com/clients/1/14/14cf715f5cd05ddba197ceaa5938d7d5/File/30015490954.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/avpmsjkt32p2sf02qd6vqdr07g/54841993990.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/22055916587.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/64566094936.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/38319439219.pdfIn PDF document text
    • https://qualitymattressfactory.com/admin/userfiles/file/bufijefaxugesavino.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160743f358e852---nidesipoxawunogokado.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/14344470901.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f4e0c5aa8---womukazovuvetizeriv.pdfIn PDF document text
    • https://edbcagliari.it/file/roletavimesebevaforonod.pdfIn PDF document text
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/bifeziradij.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/15227964286.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/67594656498.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/72228789614.pdfIn PDF document text
    • https://coil.hk/upload/files/43864204109.pdfIn PDF document text
    • http://8njl.com/userfiles/files/jomem.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/19074701130.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=pdf+reader+for+window+10PDF link annotation
    • 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_off0000c584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC584 10296 bytes
SHA-256: 4abe6bbeab3da79eca7b3fd7d7b9134ade439d3f1b5b4bf0d6e2eca596eecae9
font_01_sfnt_off0000dcdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDC 16240 bytes
SHA-256: 4b178aca4d1be7e0f7302af1dcb56b590ea00792f7d92f2fdeaaf422da06c753
font_02_sfnt_off00010703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10703 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1