Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b7662c6f3c10810…

MALICIOUS

PDF

74.0 KB Created: 2021-09-17 06:47:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a6d37e1355b0eefd9ba88bcb853933f7 SHA-1: 7d3cc561289972704ce056bbfa4121b387006a59 SHA-256: 1b7662c6f3c10810de030707b2827ee7db5925b9c8717ef2dfdfaf6a42a317c2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised CMS upload storage, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • 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://laser123.com/geektic/files/62406233696.pdf In PDF document text
    • http://lovesenergy.nl/file/2739604409.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/25627994074.pdfIn PDF document text
    • https://lenaoyunlar.net/calisma2/files/uploads/sofujawaxiranup.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/87246130934.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/sedaluzog.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/24882892463.pdfIn PDF document text
    • http://ekvatorbl.com/userfiles/file/vevidipatuxep.pdfIn PDF document text
    • http://asesoriazabalburu.org/azaba/files/file/22128101887.pdfIn PDF document text
    • https://domilot.com/uploader/files/tudil.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/bomonewivedon.pdfIn PDF document text
    • https://www.pu-sk.com/app/templates/js/ckfinder/userfiles/files/nukaleziwaleledi.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/nuxuwidirivebo.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/96007487471.pdfIn PDF document text
    • http://roleco.pl/data/aktualnosci_imgs/file/88093577648.pdfIn PDF document text
    • http://rulada.by/upload/editor/files/99946226083.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/d04fr7tu97v8jeohc2iksr9nl5/71307226373.pdfIn PDF document text
    • http://obraz-tlt.ru/userfiles/file/65642483892.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/xawamagubamemeninedisuwup.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/edb11e9363b5e8cdeaff6f9a0adba2c7/ridokeg.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/381595805beeda58050021073267fe54/12743754904.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161385c1505c00---83818993838.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/dovubotobegobu.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/jogewijokaxujuvobit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=way+of+the+cross+prayer+in+manglish+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bda3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDA3 11176 bytes
SHA-256: 4a2e2ef20349eae21502084d062eead18c1fda0ee4743b4a1d41668c4bcfa617
font_01_sfnt_off0000d764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD764 16636 bytes
SHA-256: edd61e8d5387104bbf0485ced1ee6b6679db9aaece31417d7013f1e33b72916f
font_02_sfnt_off0001020c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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