Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b40d33cb9d05fe7…

MALICIOUS

PDF

104.3 KB Created: 2021-07-01 12:45:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: ccceef8190c6f95b4b5ec2061cdab240 SHA-1: 8303836f775f559ea90be6993c5a0998faf07015 SHA-256: 1b40d33cb9d05fe714f733cdae72d48bfac9b783c984bb9b2374999c2cb8aa4a
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites acting as link farms. The heuristic 'SE_BRAND_CREDENTIAL_PHISH' indicates a UPS impersonation lure, directing users to a non-UPS host. The ML classifier and ClamAV detection strongly suggest malicious intent, likely credential phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=chat+competition+answers.
  • 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 http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160accfec5dd48---petazemanugijomogavasez.pdf In PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/fc2v6668k1t4ilt1goeurmosb1/wolokusulewopulikonip.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/3248474750.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0270227e72---32702080358.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/vilowovopufaguv.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609b093189b86---24941238576.pdfIn PDF document text
    • http://juentai.com/userfiles/files/vevesakeposavajoxo.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/a11sdbo8jvtal9vgfjr9fnvvg3/kozedagutarok.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/68421615813.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/napuwoketi.pdfIn PDF document text
    • http://agavietnam.com/img/files/meramebolosukema.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8746581c56---tafixiruwavi.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6f03e87bd---49374552788.pdfIn PDF document text
    • https://thekolkatapackersmovers.com/ckfinder/userfiles/files/fugabiju.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/077202105a327623cb86e5a3521710e1/dexokovipevigagugep.pdfIn PDF document text
    • https://papiratisk.cz/soubory/13240027035.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021522847447474.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/98174387351.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f2ecdedc0---52941045517.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/188498698.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb673f1ac48---togolotasanopup.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/b07adc6b8f11fc8186cca20cdc4a7739/nemunuvitalelul.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/nujuvixabe.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbe9fa36a3---xedavebez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=chat+competition+answersPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011bf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF4 10712 bytes
SHA-256: 2f4e566c38eb8b19097cddc57dbd3e22f0f5e6c58e72748d3d522f47d5585cec
font_01_sfnt_off00013476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13476 18136 bytes
SHA-256: 38c55119aef316c38a575f4226bcccaa4885c34744724b90e328ba5a48c2eb2f
font_02_sfnt_off0001645c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1645C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00017c6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C6D 16180 bytes
SHA-256: b1b93bc795e81bc5aa71949605a6b29bb94d1daa88d26767f2876d97ceae7863

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