Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd85c6055af5559a…

MALICIOUS

PDF

94.4 KB Created: 2021-07-14 08:30:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 71add1e07843139bfdb436483c246b69 SHA-1: ed4caaa297461dc0a87e6b372dade406d2f8096d SHA-256: dd85c6055af5559a59d318016a4a6ff2400a0984a8e6ecb7a49cd4a92f30f756
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads, aiming to deceive users into clicking them.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://crysiq.ru/uplcv?utm_term=list+of+objections+to+discovery+requests PDF link annotation
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c0vk1oq51cjo5gikp44gih9rg1/97782765176.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac103c57bcd---18957674103.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/330dcc3f807657a972d56a565856886b/jogaxelazorojit.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/luvurovikixuw.pdfIn PDF document text
    • http://camptagola.com/clients/66689/File/40782651603.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/delutogupomime.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/74ba0adf89e1f796f1132c15486ded08/kubodupimezavasediwoba.pdfIn PDF document text
    • http://gat-asset.com/CKEdit/upload/files/fesopoxabetisowiralaguzi.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b849b019bb4---87848305661.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b142d50cd40---4682409749.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/h1r14t2aou14s42jtre56d2as1/28936119783.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa86b990ba---25183182930.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/binivujojikifimoxin.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5ede4ac600e5f68e479089a35ab2432b/simaluterar.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/pugogilaw.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/16073eda6c117b---23665630849.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/24758034180.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/ff750b0fa761b47793c358d8133ce253/14628187040.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/06/file/9720825460.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073632fb59e3---sagalalebuwaxegujo.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/ab35300b5a95ba0339d410459a2a5fe3/vopabizud.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/fofuboxoruvagegupejuza.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/59306950895.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160926f57d2a23---15618555843.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/83703289ec9fb540fe8fc702b83457f1/telunonopigipufuxukab.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_off00010df9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12610 10912 bytes
SHA-256: 7937204fa8d04a723f78e820f92262084ee9ff93c89261a46148ae39bbe923ac
font_02_sfnt_off00013f46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F46 16604 bytes
SHA-256: 129ed5e6b0ab734faadb0815ccf2c2fe771d18439954127440e6242a9b00162a