Malicious PDF — malware analysis report

Static analysis result for SHA-256 3466330fce8753a6…

MALICIOUS

PDF

82.1 KB Created: 2021-07-03 11:36:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8c16c19f6d258ec82c4ee0d810e1034c SHA-1: e4d0b8f43e3f9a2275b3278cbc7161f4fb486fb4 SHA-256: 3466330fce8753a6a608524ac478924a1d8ed1ea7104e9dbc636a758b97d34f1
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a link farm pointing to compromised WordPress upload directories, suggesting a phishing or redirection attempt. While no scripts were extracted, the structure and URL patterns indicate a malicious intent to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/n3pk1ht3v35dta9fedfb2sp3r1/22671866590.pdf In PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/67755245566.pdfIn PDF document text
    • http://51-lq.com/userfiles/file///rinaronofelevatipinubi.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/62a89c08311d594f2c7cdc008a30892b/gemapegikijopameli.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/8e75197be19043eaf8c8e1cd9f74442d/modoferomodajazibi.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/41368300661.pdfIn PDF document text
    • http://ligneus.hu/upload/file/zutidigev.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075de56786ee---jimubuxis.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6079c6c2e723cb9dab0b42431c6718cf/sikubijenanov.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/3466599.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/431mpnoi0oa0eopuf4e7e9tr33/19345546524.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d183c4c43ce---lidetupi.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/92990326320.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/ecl3voecp5me7peju2f8011epp/fuvotikanenakezoleje.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c10aef7b19c9fdabf5f4f9991f8a2300/73278846946.pdfIn PDF document text
    • http://kasystemofkarate.com/clients/861259/File/wuxuzuf.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a9aebb507ee---78898753827.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608097ce7c374---56451255268.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/gajikobemuvofiret.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16073b8b006bf7---72615057068.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6a3debf0c---20521782872.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087c3ec6c272---pijidariluwoxoga.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/dolomexivuwijunulenob.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609da13452648---witokekesux.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/57854975623.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/99532842698.pdfIn PDF document text
    • http://passaicvalleyclassof1957.com/clients/44362/File/48694991913.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=giggle+out+loudPDF 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_off0000e213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE213 16460 bytes
SHA-256: c0adc742ce7917130a62c74b6246d3dbf5d4481c925238ef6322ab4dd804ad58
font_01_sfnt_off00010d07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D07 10028 bytes
SHA-256: f485714ed3dca229eca717747f68340ea7376f31b2cc71a7d72ed4251be0e3bd
font_02_sfnt_off00012332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12332 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1