Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a531d522be14075…

MALICIOUS

PDF

90.0 KB Created: 2021-06-29 06:32:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 88ebb5bde22603b230c037e1c58a05dc SHA-1: c7bf773c7e0f76aa4a9ea60b6e415fd81a7ee9b7 SHA-256: 2a531d522be14075ac85e8b8857648df5a93edc4c92d9b64a5daf9dfc4a96af9
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which appear to be hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm suggests an attempt to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://crysiq.ru/uplcv?utm_term=riding+with+death+price PDF link annotation
    • http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/52869055614.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/putelut.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec3a4c9cab---67742121385.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/h50eelr0b0s6hnt5u0vskbf1ri/95745416273.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/f04c853de791eb5553078d89119badca/xiniminisuzoketukolexi.pdfIn PDF document text
    • http://dzbnf.com/upload/file///74433242478.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a76f794cae---38344425084.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/81c1b5d9dfdf1b644a4640140dcb50ac/72339940069.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/b8c9d62829fe3bd565a84d2df5b20d88/bopiduwaji.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/47096607826.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b939d09b23b---xobero.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090985f898af---sefakinolalerisuvivov.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7610963f5b9dc64e408ed785ef239982/37387979238.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/g9tlshl7bpb4d3slbaueafmv1a/34316757570.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/e7a88177e096ad8341146ac55ea06dd4/paxeseb.pdfIn PDF document text
    • http://chinocorporatechallenge.com/clients/6216/File/vopinizimizebiriwazatisiz.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f315e9d7f1---82785603618.pdfIn PDF document text
    • http://teraval.cz/res/file/dekabinix.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/870e267ead67720b13383e02d6131422/wowiwomabofixur.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f99068fca---legolowivedada.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d7766ab4fd0---rikenatimen.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/larusanuwemevavirasu.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160d459a3d8131---93135065234.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecacdde2e8---2426894217.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/vupafexidarika.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_off0000fc7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7A 17544 bytes
SHA-256: d8d55dbd3ed833fe327d9cc861c37c5def2deb6bb9c69936f149a60ae88235be
font_01_sfnt_off00012a8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A8D 10588 bytes
SHA-256: 7408c8cbad5262feabff75b68d6ef83dbc19175a0c57d5121c1bdc500cecea4f
font_02_sfnt_off0001427c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1427C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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