Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbfab02916a5199d…

MALICIOUS

PDF

111.6 KB Created: 2021-07-24 08:03:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3a582fd57bab90d648d2d72ed81145b0 SHA-1: 3abf85ca431e7febe26a341dac6ff9bcbb0d92a2 SHA-256: bbfab02916a5199d22fdd61e9bf0696ac619824d04696223d12ae123a27d8320
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised CMS uploads, with numerous distinct hosts and disposable hosting patterns. While no scripts were extracted, the PDF structure itself likely contains embedded links designed to redirect users to malicious or phishing sites, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://refour.dk/wp-content/plugins/super-forms/uploads/php/files/e0a8202ccf2d3e013b18a3e6115a70c4/57207386946.pdf In PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/208v0c19425ala5auckuj5loc7/jubogekowi.pdfIn PDF document text
    • http://businessvaluationapp.com//fck_files/file/legukozixifenebivemudiros.pdfIn PDF document text
    • http://raczcsalad.hu/files/84800341002.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b808702543e---mewofelojumakodikigaxa.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/jizeliwowuvogisopixulevup.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/4fac9e357165ce88f1b32b34a8f3c753/40095024370.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/bopinigalisebetu.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160b33d871a1e0---wukeno.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982d5e90b6c---miwodavofifagira.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/7359611297.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/90028596703.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/72562509823.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/8abe445b69f2ee7fe4353063b56e2cae/55674110008.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/80815427830.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/ee0e3d2d2278f79fce33932d92fe4c52/rifit.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/d9b7349a1710bd906f7e37ecaea005d7/79521626577.pdfIn PDF document text
    • https://q-web.ro/wp-content/plugins/super-forms/uploads/php/files/tit0kjb6h21h5i4p877tdvjtf2/48384049975.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/e66998ec95e5dda58aa05126104bf3e4/88030361098.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b09f2dbcf2b---46806963586.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160821ebac60d3---keserubazaluxitadutonufef.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ecc90faa7ba---85399793010.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=fuentes+de+informaci%C3%B3n+tur%C3%ADstica+primarias+y+secundariasPDF 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_off00014ad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AD6 11128 bytes
SHA-256: 9891b12f17ec91dec8c198a37717b9453bf3760badafb218750b989b021f21c7
font_01_sfnt_off0001648f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1648F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017ca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17CA1 18868 bytes
SHA-256: 07a58a65995398a245aa8d8529fabb86d230214269433179c75a70cebb531feb

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