Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ba879f2b8d11e8b…

MALICIOUS

PDF

81.5 KB Created: 2021-09-05 22:18:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 983075ac9196aba73bbfd0a94a99d82d SHA-1: e4b2ede3192427bf29869268be8c472b5fa93a2a SHA-256: 6ba879f2b8d11e8b86277ec10c1522ac5c3ff7aa2e9b46bd5c99d11eba1d7312
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm for phishing or malware distribution. The presence of 'utm_term=online+document+to+pdf+converter+free+download' in one URL indicates a lure to disguise the malicious intent. While no scripts were explicitly extracted, the ML classifier strongly flagged this PDF as malicious, and the overall structure points to a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 5

  • 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 http://architettotoma.it/userfiles/files/gunevafoporin.pdf In PDF document text
    • http://beachhigh65.com/clients/879402/File/miluv.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160cb1b783a1be---43615191501.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/c5497b6975877871b004ae152df9f4ee/70827639847.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/vozurometunegowelonadapiv.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/11747825871.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-6/20210506080354931986.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/38069714148.pdfIn PDF document text
    • http://woykoff.hu/upload/file/37962202894.pdfIn PDF document text
    • https://midasspa.com/ckfinder/userfiles/files/98693705123.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/30487582086.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/35777981506.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/u1c9jk87961590j0mm9m7g6758/2576913491.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/431058b1b68ae150c4c6faa3676aeb85/63194171493.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/mogokevuzipimud.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/cjehcr6nugds6n5inerj1csu10/duneja.pdfIn PDF document text
    • http://jkmdc.com/aversystem.com/userfiles/file/fomivafusosutevimu.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/6mu5iod4kidbsacbpttttgegf3/12777726617.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/jatusepetatedaxu.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021052900591196.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/39830603946.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/gunasulusubofimid.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/i9k88jood30tq58b01jinauot7/parabifafegufokepalifefa.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160c9bb38adb29---kovisujadukotomikaxavo.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/wavadizutukumos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=online+document+to+pdf+converter+free+downloadPDF 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_off0000d99c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99C 17488 bytes
SHA-256: 27052f1b30986dc462f56f58a7be5fb2deb7740bad2c3459d411e18f74402e61
font_01_sfnt_off000106c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C8 10888 bytes
SHA-256: 474bd846c26eff220661e6e15b1a2ef894668b330e4ffc6986f20f4d022cf409
font_02_sfnt_off00012002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12002 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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