Malicious PDF — malware analysis report

Static analysis result for SHA-256 74535634aa03f130…

MALICIOUS

PDF

90.7 KB Created: 2021-07-05 04:03:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3c0fc4b3f0ebbdc23c91049399a6620c SHA-1: f15ac5853e3cfd13d667732a10bdd76546000c36 SHA-256: 74535634aa03f130a0c15ba1f10d69485ecc8cab48c30510c8181bf4139a3a38
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, suggesting an attempt to distribute further malicious content or conduct phishing. The ML classifier strongly indicated maliciousness, supporting these findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/82420cb3de7130cc042f74be4ee236e4/14967507091.pdf In PDF document text
    • http://benhvientantao.com/img_duhoc/files/kafofotide.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/devitise.pdfIn PDF document text
    • http://citywideok.com/clients/75789/File/87051266418.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc941086da---vomosotutamudusixemilis.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f93daca037---kekajuwifisupoparoparus.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/85513928211.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/19887d5d59db264981ab5e515bb42677/77966135577.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/6331035950.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/66397904137.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/gowipavanijubogar.pdfIn PDF document text
    • https://restavracia02.com/userfiles/file/25060657254.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/fcc7aae928ca6102d466ad505c6fde45/lezawarokiv.pdfIn PDF document text
    • https://anjingliar.com/contents//files/momofarilifumifaxux.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/vorugax.pdfIn PDF document text
    • http://marty-triple-m.ch/inhalt/files/gotivuzejesigaxuw.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/7a02644ef1f4dc26617d3d9a577dca3f/bekukolebej.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16083576e4680d---xusese.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/022dcc2eeaf5d7feb13863179b7a1352/3409615916.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/679c8256bf0c45f055d0e92859c88501/zepagonopogegudatadawisix.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160718a3242069---sanoxakujaguxobepetelir.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/e471f1cc5afe028627f85a34677ddf89/88854138200.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/2711e7d0a94c2ce607e513c2cbc32413/vabakatav.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160917ebeccdf1---2932014039.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210703022446_mricdc.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/puxifodumiruzisasanur.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1607e129e201c6---mafobubixa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=only+fat+around+bellyPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001001f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001F 10464 bytes
SHA-256: 1729939fcf1f1b44a8cde0216341bf8203337612e2116ead32fea79e7760e380
font_01_sfnt_off00011811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11811 17372 bytes
SHA-256: 60a738d6cb26c338f97edc430fdce881224f169391f10a4494d4ade559686586
font_02_sfnt_off00014545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14545 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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