Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6be8169bcc6a89b…

MALICIOUS

PDF

72.0 KB Created: 2021-07-09 05:17:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1ef456eb6baa1c4f2275ad6e95004c47 SHA-1: a132e9dc34b5fcead885e04b9d56c05ba8dcf66d SHA-256: b6be8169bcc6a89bf34ab62cc379e74f72f170c49b2a2fbec19abe0200768de4
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. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites. These links likely serve as lures for phishing attacks or to distribute further malware. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/l7ooc7bp7a2ude6ntdmg9117be/polapegosib.pdf In PDF document text
    • http://nutronicltd.com/userfiles/file/pakotisodalukixonu.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/8362382749.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b62dc4bd470---wuvivexozobudububixo.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/6255254a09bdb0fe43cf78a7877063e0/26273672806.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/66768561966.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160ac566f79abb---89267521049.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/67128583594.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210528_03E91A7C343BC993.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/404bd3d4913a5689ce319808b7a9b421/xexoworotuzekunagon.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a1b55e9ff---jifamizisevolitusi.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/kowel.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607241b1eba7d---bufanazefufumujime.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160e314053f35f---pukonebika.pdfIn PDF document text
    • https://unosms.us/userfiles/file/41443461169.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/99589041281.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/5a8c2f5c1943cb962355d7e98d2c1861/41611891927.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/49e6aa53ce675fbac01ce451f06f2b77/86881905986.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/fozozexuvozoge.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc5d1e445d---fabutolalimajuxadojuw.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a771adab0d---jazalorufawaxu.pdfIn PDF document text
    • http://hanarotalk.com/userfiles/file///turofumexoragoxekibivukiz.pdfIn PDF document text
    • http://www.buildingmalawi.com/images/uploaded/documents/60867094243.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16097df193d332---fajexafijot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=learning+station+haunted+housePDF 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_off0000b94e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB94E 15944 bytes
SHA-256: c636d0abe6a1cb7d814648c6df8cb8af00881a7495c98d4cc47723d369c01b95
font_01_sfnt_off0000e2c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fadc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADC 10536 bytes
SHA-256: 902ae9ee22357e480a8380c1044538e7edbc1d7810e2b772c791790e844729b0

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