Malicious PDF — malware analysis report

Static analysis result for SHA-256 e66785cd70ca5d29…

MALICIOUS

PDF

74.6 KB Created: 2021-09-26 10:45:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 301abb500356139be68528aa41a2ae24 SHA-1: e30759b0c44a2a2f4fb4fbf9bbc1d1b2fe57b183 SHA-256: e66785cd70ca5d293a1883edc4dc3608ef4fc35f2bdb677a596a75bd12d11b0e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified 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 WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' in one URL further supports a phishing or spamming campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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=pirater+tablette+android PDF link annotation
    • http://www.buildonhope.org/file/lojejib.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/gejevepebamizigenesuj.pdfIn PDF document text
    • http://hykylalumni.org/userfiles/33345006869.pdfIn PDF document text
    • http://hzeiger.com/userfiles/file/rolosojidabupijosubuwe.pdfIn PDF document text
    • http://vattuxaydunghl.com/userfiles/file/dijidimas.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/gopafomisukebowuxarudumer.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/69320746024.pdfIn PDF document text
    • http://celeb.huh.hu/UserFiles/File/derapumes.pdfIn PDF document text
    • https://samoinstitute.mn/uploads/assets/file/15827905337.pdfIn PDF document text
    • http://bkm-market.net/userfiles/file/raforu.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/pobesabeniguxozajagazo.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/9dj5ivijjhpfd4hhc9e5t7vo08/nonoputubivafaxowefupufob.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/tinopipenuniwo.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/68557455245.pdfIn PDF document text
    • https://perfumes.dropship-tracking.com/userfiles/files/golikekogotizin.pdfIn PDF document text
    • http://mosme.org/uploadfile/files/sidoj.pdfIn PDF document text
    • http://aeklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dovesegubokibazapagawizu.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb3d72d76a---82739266870.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/161488d15b7983---51467063457.pdfIn PDF document text
    • http://srmtteaparty.com/uploads/files/202109200700489858.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/zufalazitet.pdfIn PDF document text
    • http://hyundai-baoloc.com/luutru/files/demutapomikomejuredefeno.pdfIn PDF document text
    • https://dol-rtknetwork.com/uploads/files/89634627968.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_off0000bffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFFA 17920 bytes
SHA-256: 41ae63c0f0280270d147edcfaabc0236250ac54140a1b8b6c07750fad28cfcb6
font_01_sfnt_off0000eda0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA0 10212 bytes
SHA-256: 0df23533c1438f6b0fdc9b3b5c5fb354fe69bb7303672d001d2d37b849dd061a
font_02_sfnt_off0001049d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1049D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1