Malicious PDF — malware analysis report

Static analysis result for SHA-256 7eace2b5c45ead7f…

MALICIOUS

PDF

87.5 KB Created: 2021-08-28 12:54:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 0ebf1b0f8a7176d42c921dc66d327066 SHA-1: 11ee9d55e18f1979afd7efb3abc626517ca6ce21 SHA-256: 7eace2b5c45ead7f3fa171215df6be1b682f87a8530c39908567972c482bcbd0
156 Risk Score

Malware Insights

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

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, pointing to numerous URLs hosted on potentially compromised or disposable domains. This suggests the document is designed to redirect users to malicious content, likely phishing pages or malware download sites, rather than providing legitimate information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://liburnia.pl/userfiles/file/56004914742.pdf In PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c33cb4475b8---12791899063.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/relotazuzuxesedakafumi.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/lanujowekelagamav.pdfIn PDF document text
    • http://xn--82ca1bkibi6eufn5bh1b7i3e.com/UserFiles/File/40074936027.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/bokixigaguwomipawinimi.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/p3gt1em45lcjru7f2359104fb3/133131561.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/ba938e1fb792dfa956be44d4064fe83c/zovegavoj.pdfIn PDF document text
    • https://recrut.com/files/files/10468478140.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/s1m45p7gdp77m7pbe80tt9lfi6/bosubufo.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/2345ed1812de31007310357507f3fe19/runofinaxikokivutadabiji.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/budowovufadew.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/76719600349.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/16701350625.pdfIn PDF document text
    • http://myjacksonfamilyreunion.com/clients/e/e2/e2167ce47089e9b789d53270b7cccc99/File/vezuzelometajofepak.pdfIn PDF document text
    • http://arredamenticucinesiciliane.it/userfiles/files/foxugiluviwafipova.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/92270770046.pdfIn PDF document text
    • http://dtcguild.org/clients/80367/File/ximeneginez.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160fcdfeb7ad1f---97735290707.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/33905109757.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/3dvj531ebce6adqrii5d33ld4f/vaxojuvapuxuvufazudazan.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/lusiwebejokedowajilodeki.pdfIn PDF document text
    • http://yjccnc.com/upload/files/fovunapexepumerumir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=main+purpose+of+exclusionary+rulePDF 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_off0000f3bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BD 16980 bytes
SHA-256: b1f7e6629d3c0cbb8f12ac10d787c92b4feab3a74553829b7861855acb7f1e49
font_01_sfnt_off00011fba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000137d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137D1 10684 bytes
SHA-256: b5cd2e835a4d2922e5899bad1beee3111a0b8e202d449863587324272b0a310b