Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaaf887ff77d13c6…

MALICIOUS

PDF

86.3 KB Created: 2021-09-04 06:45:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d8360d50fb43844441af5e51d42901c0 SHA-1: 1579d2c6d69e910294a55d5cedee2858e3e41b7f SHA-256: aaaf887ff77d13c6ee8bca27130d5ae96c840fb28de20c58ced95ec6f4a61313
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites, indicating a link farm designed to obscure the true destination or host malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of external URIs and compromised CMS uploads points towards a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16091f626e7124---kakopurulesa.pdf In PDF document text
    • http://condominiobrisasdelnorte.com/userfiles/file/78582746046.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/gozisubawiruniriribupazo.pdfIn PDF document text
    • https://www.educazionesessuale-scuola.ch/ck/ckfinder/userfiles/files/nodol.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160968f2edab05---xizepi.pdfIn PDF document text
    • http://dienmaythanglong.org/uploads/files/xuzexef.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b64a8524ae---99560379208.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/75bc20aad302018cabfdace9d6070e91/kadipaxizexapusiba.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d3e7b8d6c---50900012111.pdfIn PDF document text
    • https://www.highettmetal.com.au/application/third_party/ckfinder/userfiles/files/kiwizipata.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/7d3778bd46c9eb151499aeb5cd09dc34/fubiviwuwebisejuf.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d9eeacea532---gagibopuweserikivi.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/160828cb3ab214---44763698371.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608463a4a0165---3406240750.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/lipozurusix.pdfIn PDF document text
    • http://www.kroonzuivel.nl/ckfinder/userfiles/files/71080193282.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/20214291651373932.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/wozepomibuxelumed.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160881a0d234e9---genuwakovunutufajem.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/wekutagukaxejerugo.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/44429971173.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/7574d76b6c707db8315600bea82925e2/vosesoxasefopexajesobegis.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/35174738445.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/31723012894.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=reported+speech+pdf+bachilleratoPDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/vekazurebogigarupog.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_off0000e5a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A2 19864 bytes
SHA-256: 495d7e8165d134f2cc6755945a65ca28d74433bd9e9b97caa2b85620d4681433
font_01_sfnt_off00011a32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A32 10796 bytes
SHA-256: 576553a4f17e541ff996445f0e227a71b82d33b6f724e51a3e161b064d57f998
font_02_sfnt_off000132f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1