Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1c7c8f9f87b80e1…

MALICIOUS

PDF

84.2 KB Created: 2021-06-29 08:34:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 28b9049f0fa1e9a7bf5565dae29c771d SHA-1: 0b36e21bd9f30491a228531715ccf3bfb41349c6 SHA-256: c1c7c8f9f87b80e1966495e75421586733825e7a233eee436c12346ed6b42263
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, directing users to multiple external URLs hosted on various domains, some of which appear to be compromised CMS upload storage. The document body is heavily obfuscated and does not provide direct user-facing content, but the heuristic firings strongly indicate a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://workcoop.org/fckeditor/userimages/file/20210625045346.pdf In PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/75779696712.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc66c645feb.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a21cd666c67---xusor.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/kelexapevet.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/mefozixebapopu.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160805b741acbe---38001321146.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/96014248445.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/7431712b50e79c9ec69a520dfa88b177/lananijonobopilon.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16095c5f564eec---vunowewopalafuzitesilavi.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076bfe343846---49908826190.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/hcn7qdt9ub84rbmm6gtbsj5cds/zanemifofij.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/jasepawasoti.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/sawesetetojedoki.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/sarexowilip.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/f2919a6f822be9f54d20fc9d47f31a97/vapop.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608b716521f44---fakadatasezepebatalalub.pdfIn PDF document text
    • https://armandofalconi.net/userfiles/file/segojowukotufilodu.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbe9fa36a3---xedavebez.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/sobuxi.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/newutajefojubugidulopof.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/d6n9upr42g31cfr2o5agem5r5g/2274813077.pdfIn PDF document text
    • https://dodatnojamstvo.com/userfiles/file/monavepu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=the+unholy+vodPDF 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_off0000e7c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C4 17596 bytes
SHA-256: 7c7fea21462242686bdd4e91b17eae8d955e188cdf45a06837a454623e568315
font_01_sfnt_off000115f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E06 9968 bytes
SHA-256: e7053bc78525c6acc9d3df0cdde9b0bf4b298ecc66119b7d472f107d138baced

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