Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3830057092fd8de…

MALICIOUS

PDF

83.0 KB Created: 2021-07-30 02:57:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8cfad513eb6024f312c0e7c74e7f5372 SHA-1: cd9ea44aac78bfa6da88105208019e1399f13d8a SHA-256: d3830057092fd8de7bf317001c15630e7872317fe6b9f14c5a6aeee0fc0fa4ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external URLs hosted on potentially compromised or disposable domains. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://allytemp.ru/uplcv?utm_term=coordinating+and+correlative+conjunctions+worksheets+with+answers+pdf PDF link annotation
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16071b0adb4606---valel.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a347cc77f9c---noluwunujezefes.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c9872b429ef---3089079334.pdfIn PDF document text
    • https://transilvaniafishing.ro/app/webroot/files/userfiles/files/51035494820.pdfIn PDF document text
    • https://szud94.hu/img/sajatfile/files/moxubaripafanuwasixi.pdfIn PDF document text
    • https://hojoairport.com/images/file/24125823507.pdfIn PDF document text
    • http://websurin.net/UserFiles/File/guposik.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/55591978415.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/02d0e7d60ea8a3fe9e412bf9beac074c/sewejajukore.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/fuviwanolaxazesem.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/sogelasaximopemumalokilej.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b386b6e172---xagimuvowosumagose.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/zuxixifelopapefexesituter.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/d87bf5ae4529f22a769ad961bbb66145/80997059700.pdfIn PDF document text
    • https://ayurmitra.com/files/file/vodan.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210511085341.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/mugok.pdfIn PDF document text
    • http://jdhs77.com/clients/58520/File/tenodegirulokofox.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/vunazimawuto.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/58858847998.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/5b89f067de50e6b925f35ac9d3e3579a/bosonugavonatamejip.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/dobupebik.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/eb2675ec8a872e9ba58cd144d7b12caf/zisepuxesisip.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_off0000ddf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF5 11404 bytes
SHA-256: 7a8e91a8b30c39222b37775566d342438af4dfb4bcad88440e6fafda3a2feb41
font_01_sfnt_off0000f8a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A2 17252 bytes
SHA-256: bf5afc6d70a5d95e03ceba637704b17215802cd6eff267c3b9dc93c6db81332c
font_02_sfnt_off000124f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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