Malicious PDF — malware analysis report

Static analysis result for SHA-256 71c82d950c9fda87…

MALICIOUS

PDF

96.2 KB Created: 2021-08-05 06:28:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9b845e305e2da0233d7b7206d9c00a8c SHA-1: 00e5669fadeceff4bd76273ca6c815167b5993cf SHA-256: 71c82d950c9fda87637b35945af0695a96c4f380879acbae680e043e93bb12a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a phishing or trojan distribution attempt. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable domains, likely serving as lures for users. The PDF structure itself is heavily obfuscated, and no executable scripts were extracted, suggesting the maliciousness lies in the embedded links and the document's deceptive nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://gobelsprofil.com/upload/files/45793497380.pdf In PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/fae66f9956bcbbd187cc48ed4b0bfa57/67366886159.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/735255d518129e40d978f0b319653ee1/lurabulavopovodowogogu.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/89812359805.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/38448688151.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/lebono.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/16092aab046f0a---72985060056.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/junelozupiwuwili.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d786a68cfc1---kugoze.pdfIn PDF document text
    • http://www.centralperdana.com/file/lolozimene.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e3a223ba68b---81044866968.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780c224e70d---gojepadoruzamog.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f48bca25fb---83034859408.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb25b31d60---xezanufoxajek.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/wosizutovata.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/dilefozopa.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160a915cee37f4---78658157127.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/nazegivazovavumiwomup.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a4566713871---56973911686.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/gaveluraxeten.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/37937639518.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/sezolej.pdfIn PDF document text
    • http://kccmaul.com/files/files/16395630407.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/weberewaso.pdfIn PDF document text
    • https://topupdana.com/contents//files/69953805290.pdfIn PDF document text
    • http://www.youtIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=biblia+ortodoxa+pdf+gratisPDF 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_off00010d3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3F 10732 bytes
SHA-256: bc4476accfeaa3b872cf1bfaf9f153ea2be70da5a5b8c5dc478346e4ce9a7991
font_01_sfnt_off0001259c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1259C 20120 bytes
SHA-256: 7810346fa4d6cb0d4452c5231853fa842ba51318b6bebca89e7a63b60df30286
font_02_sfnt_off00015851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15851 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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