Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb6f654d1a1ecf04…

MALICIOUS

PDF

83.1 KB Created: 2021-09-02 01:59:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ed5fb1090ab0ea7ebfac92e1583bf397 SHA-1: 5ea23b211df007274c5e5f681afd071a1de36fae SHA-256: eb6f654d1a1ecf04fd63ad5eff054b9e492ab80e965e52aa7c03f7b76da185fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to various compromised websites and potentially malicious PDF files. The embedded URLs, such as 'https://allytemp.ru/uplcv?utm_term=visual+basic+6.0+tutorial+for+beginners+pdf', are likely used as lures to trick users into downloading further malware or engaging in phishing activities. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://allytemp.ru/uplcv?utm_term=visual+basic+6.0+tutorial+for+beginners+pdf PDF link annotation
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/2db60af95c72d84e871b058837491f02/33704386201.pdfIn PDF document text
    • http://sourceandsecure.com/uploads/userfiles/file/93550284139.pdfIn PDF document text
    • http://lmtechsolution.com/userfiles/50099585961.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/15047233041.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/cca9dbf391dd93d008b862b6af1aede7/bafaw.pdfIn PDF document text
    • http://qkmedica.com/uploads/userfiles/file/belimuputesana.pdfIn PDF document text
    • https://avela.md/userfiles/file/76175226540.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/dc61d4d75660bd0010fcf36ca07b7c7b/62442309071.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/21082539140.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/7685243135.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e17b1048643---24806526564.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/sibijigememimanijavoreguf.pdfIn PDF document text
    • https://tsafar.ir/basefile/tsafarir/files/titegusipexefepetebimenu.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/67817964788.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/18242750272.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/vovinugukelexigovategifa.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/24605632077.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/donuduvej.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/95336931504.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160989e01cdd59---sinezogezifemodekibuz.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/55439580467.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/27627528844.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/xisiwiluboni.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160f0565826d74---84788056661.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/bb9a96b032ec470e9e1d258f95a96a2c/46028997655.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074162ecd84e---juzuzekimegiga.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_off0000e0d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E8 16504 bytes
SHA-256: 320ec53034850e79c85f37c0c7cf94883067afffe4a129a95b40a98dd44eac9c
font_02_sfnt_off0001237c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1237C 11360 bytes
SHA-256: 9d1b819fb2103bb368ea9c9b118b74c51ce070f5373920db1897673bc096eee7

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