Malicious PDF — malware analysis report

Static analysis result for SHA-256 2157432df8763f09…

MALICIOUS

PDF

70.9 KB Created: 2021-10-04 00:42:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c6ebde14c4b78dfa81bd8a22bc60ef6f SHA-1: 793c0586739ffe5426406958026904319cba1841 SHA-256: 2157432df8763f092f95b422de0ea52847efc3861ed90966d7cf7d11cc172816
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Heuristics reveal a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the nature of the URLs and the detection names imply malicious intent, likely involving the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://ketchas.ru/uplcv?utm_term=idioms+for+feeling PDF link annotation
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16144bab145f86---1637656745.pdfIn PDF document text
    • https://meritumptt.pl/dokumenty/file/lubedakajoduze.pdfIn PDF document text
    • http://teakdeck.pl/files/file/48297287145.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16135bc3890946---dikowawafufodemuzi.pdfIn PDF document text
    • https://livermore.com/wysiwygfiles/file/39975416583.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/piliverax.pdfIn PDF document text
    • http://ototavandosemesi.com/resimler/file/56758468787.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/gemilodewawiti.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/48228851173.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16159766a22ed1---xebebopakitizoweforakor.pdfIn PDF document text
    • http://pmke.cz/pictures/files/66889783717.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/20219286345527.pdfIn PDF document text
    • http://katela.net/userData/board/file/74138717090.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/mipejagaguvudibuvalapok.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/du7j7g748nl6h29l9dl1d57q43/11610498837.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/b0fbbd187ec011c7fdfe0628791f49f0/15583007096.pdfIn PDF document text
    • https://traicaygiasi.com/Images_upload/files/sodadimupamaz.pdfIn PDF document text
    • http://gugugroup.com/userfiles/konudifuduwewixovasu.pdfIn PDF document text
    • https://festacontinua.it/public/file/92907027735.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139622ce3d5d---80328263931.pdfIn PDF document text
    • https://spyboarcams.com/files/74255065824.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/30002287478.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/7a66b40bba9e9f1e30f741639a85bebe/32889880452.pdfIn PDF document text
    • http://lilcash.com/ckfinder/userfiles/files/kekejitanesimuz.pdfIn PDF document text
    • https://jnnjhansi.com/userfiles/file/1977681013.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_off0000b2b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2B7 10388 bytes
SHA-256: 22491e8b0754aa5d7383ab2aba7e9ab5b4f621c9b0260b99f1355ddb2aa35f2c
font_01_sfnt_off0000c9e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e1f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F4 17548 bytes
SHA-256: 4984112bf8271b6dee70801f20ed4485ce13306725380d0ed39559760f2b1bf8

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