Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1052ed5ead9ab26…

MALICIOUS

PDF

83.7 KB Created: 2021-09-24 00:42:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 14db611f87beccf43bf1c76f1e26b959 SHA-1: 40b74232c8b56c438b183dfa5920cc677fd655ec SHA-256: e1052ed5ead9ab26d47d238e1437dc94a0f3720926a0a59164bc6282c053a48b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated and unreadable, providing no direct user-facing content but reinforcing the nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://archism.ru/uplcv?utm_term=cara+mengunci+aplikasi+di+samsung+galaxy PDF link annotation
    • http://anpo.vn/upload/files/85493985379.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202109031610127711.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/707388736.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/b91be4d0769d399046b4d236278f7131/61717441699.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/um0q8brhurs3mqf21bpdngkg71/zinewazikes.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16140f33a1d63c---53061929744.pdfIn PDF document text
    • http://www.scsk12.org/policy/files/files/18483956555.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/zikisozogerubigepowize.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents/files/73241460049.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/2c9d95f48c97c25996b2f08ce04bc26d/43573932984.pdfIn PDF document text
    • http://primethailand.com/ckfinder/userfiles/files/94900464266.pdfIn PDF document text
    • https://hoavily.com/uploads/files/3954389462.pdfIn PDF document text
    • https://moolans.com/uploads/files/38521146356.pdfIn PDF document text
    • https://equinox-e.com/upload/files/95257328599.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/39957680062.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cf2175bc1c---447148547.pdfIn PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/89967731347.pdfIn PDF document text
    • https://inks.bg/userfiles/file/85719532739.pdfIn PDF document text
    • https://pharma-tools.pl/galeria/file/25152093106.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/govejezelo.pdfIn PDF document text
    • https://gemicilojistik.com/userfiles/upload/file/viwadamerejim.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/27814917763.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/61537438287.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_off0000e287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE287 11076 bytes
SHA-256: 1c1c7693fbb9a920fa93737acc4381b41a131a9657e4e013ad7afc946aac2ae7
font_01_sfnt_off0000fc17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC17 17128 bytes
SHA-256: 7986030891c396e464e74bf0428e65dec540a5e2ac6e36b4e99d51f6de2fe354
font_02_sfnt_off000128e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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