Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1012eebc3dd50c3…

MALICIOUS

PDF

79.3 KB Created: 2021-09-05 19:53:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7198dda06437c57303e9c13816adb0f6 SHA-1: b9c290bc51d5b8b762085bc3f9482dbf2bce4df4 SHA-256: c1012eebc3dd50c32af115da3a9b7792c8bbfd8950b1ce949c8d964062fed046
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. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm used for phishing or malware distribution. The PDF structure and embedded links are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://hkt-optics.com/hkt/images/userfiles/file/lotoxadipepodut.pdf In PDF document text
    • http://maimungkorn.com/UserFiles/file/6838794982.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c400984d1e---94841039453.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed668153173---4851127359.pdfIn PDF document text
    • https://path.mn/userfiles/files/saxolowixurukirofub.pdfIn PDF document text
    • http://old.smartplus.pl/ckfinder/userfiles/files/77522953396.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/kabojakorafidopalilurib.pdfIn PDF document text
    • https://strechybenesov.cz/content/tamegepazavowow.pdfIn PDF document text
    • http://ibb-online.ru/f/file/vuxivuje.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/d17f31a9d2eb27da245e5c48111e3b9e/61873758659.pdfIn PDF document text
    • https://escolaalfa.com/userfiles/file/29378423625.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/pidak.pdfIn PDF document text
    • http://lakehighlandsrw.org/clients/863582/File/xigakubalumanetejej.pdfIn PDF document text
    • https://rais.bg/uploads/file/98143649073.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc520cdc2d6---visid.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/53479742221.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/76363511126.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/f50c9868cbe722f237d999faf4f5b484/92754904858.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/2021722522416976.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/jowege.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/55144018596.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160941d9a94a1c---52810353993.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/07068d3d1a555add0224112a11743316/jadozu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=combine+image+to+one+pdfPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/d00aa5c5d5ceda9dfb08c58975c9e6f2/82049055419.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_off0000d181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD181 17820 bytes
SHA-256: 618e3662a4a71937c9c3baf63ec1c52f46aa36d4d1aa48d12c8737b1b2336507
font_01_sfnt_off0001000a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11821 10696 bytes
SHA-256: a658f1be4906d6314ce16742c311ed9f1e04c78326a5b15d2c20dfd238d24f67

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