Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5a62a0496d9b9ea…

MALICIOUS

PDF

87.8 KB Created: 2021-06-27 00:59:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c376bf8b1126a740fac71cf13208b0af SHA-1: eeb0b3fd8070e20d2a6cc05aea4645d22dd09d91 SHA-256: c5a62a0496d9b9eaca270706e850107739793477dfea2595a84b18327fcaaae9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and link farm indicators strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://pixomot.ru/uplcv?utm_term=how+is+oil+painting+different+from+acrylic PDF link annotation
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a8aa58623aea69cbabdbcfa78624f5c6/gimip.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/8q1ihto072l0dhiqqusi1r8bgt/pajixeg.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160927cea3d73d---galifejinabofokukiropus.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609554cc6ac9b---vijagidirovuvemekulu.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/gitogezutejabokiman.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4feda64536---94169734721.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f6429c64b---74879272240.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/5a1c8d3554bb63f312f5cfd923ed322e/loxewijupebusipugisona.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd57e288f27---tutidixobu.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/nt68t8otmqfs8rliiqq5mk6u7i/kojugidanujotemojituvivex.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/58d1d4ca7d6fc21171ccf89b0f08fe62/rizaxuvetaz.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/fofelo.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/40900043615.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/76v35ubnao3h5nbnmlo6ejji14/65522420168.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/fb75e45ed8444d40e62c0c9ed0497569/78685590916.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/56309771614.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/wisuxamutejasakunukelemaj.pdfIn PDF document text
    • http://osrclass1967.com/clients/8/84/84e84eb3bb32f45446e669e24fea3ebc/File/lemujekeroteb.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c12bf31dbc1---49321182932.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/o8mg4cvigcmedo47j23ab88kc6/basopigugip.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/d3c9d12202ec4c4387c92dc4a066bda7/wufeperoximosedoparagawi.pdfIn PDF document text
    • http://fletcherfamilyreunion.org/clients/52745/File/nadodozuzejukalorose.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/rokefanese.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/98607071057.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/17134402769.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607415f6cafde---67276083309.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/nifatadonesurefumujovemun.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_off0000f426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF426 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3D 11156 bytes
SHA-256: 85d9871a1e09780ed35478dcba0a4dd87b5235338dbe65c1cc77a50dd3ca39c5
font_02_sfnt_off00012629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12629 16636 bytes
SHA-256: 83b0494bcfc263e8d3d369c4ede40ceee22e39c51b58854af126de3873d440b8