Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ea2aefee488b94b…

MALICIOUS

PDF

84.0 KB Created: 2021-08-14 22:47:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 818098a7f15dbd7d85502ccc320d9f7d SHA-1: 53e173eb34abbc000874ea8a6e5603f291363e9c SHA-256: 5ea2aefee488b94b0a4bb60471284d84d1c268ef46e45d6945219dd3a3e788b9
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, detecting it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised websites, likely intended to lure users into downloading further malware or submitting sensitive information. The presence of multiple distinct hosts and the use of UTM parameters suggest an attempt at SEO manipulation for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 6

  • 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 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://oniceh.ru/uplcv?utm_term=1200+bosquejos+biblicos+para+predicar+pdf PDF link annotation
    • http://adbuilder.at/ckfinder/userfiles/files/bemidetomibopekokivivavu.pdfIn PDF document text
    • https://manhremhoangvan.vn/wp-content/uploads/files/sojikitababexemojukel.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/nerumabu.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/c1a3ca67f9c8b1ec8212999a0ea0f88d/fatitu.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160f211a4e1aee---79077356521.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/2r3toh4ci8t373re3qg00l9p23/96293254048.pdfIn PDF document text
    • http://crm333.com/documentos/file/busilunemulip.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/8c41836805e12bf1a5401cd1ccc65c78/74136109716.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/68850059430.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/b7107ea4d34d57f224112d89150a5669/vufesepegafixizivezufe.pdfIn PDF document text
    • https://12tiga.com/contents//files/boxedados.pdfIn PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/jinurawomikim.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c525b8452---45733412513.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0bfda4561---455236437.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/files/xowumawi.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/c6d4bc4c276e18e95b57c0e6550eb16f/safofezozozenanazabeje.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/pepudupisexesoserutenirur.pdfIn PDF document text
    • http://donghocasiochinhhang.net/uploads/userfiles/file/kusakagoligojadosonivi.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/jetuwanakunukopunokuze.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160d91fbd1f342---xadozivexuxajupidomagif.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/19614004214.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/caba734d705b32637f569b57931bb0f7/renasexalasajefeno.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/getigibo.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/20134884800.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_off0000e063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE063 11124 bytes
SHA-256: 41be9461ecaf4103590244a3fe5504ec4ee41d35735da3dbdc3332ccda3cf47d
font_01_sfnt_off0000fa01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA01 18088 bytes
SHA-256: 8b68b1923d4f884e5103721a70bc3dc5f4aef9d62025f9bb6ff8579783cd19fb
font_02_sfnt_off00012790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12790 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1