Malicious PDF — malware analysis report

Static analysis result for SHA-256 77e5ff3f600a7d5b…

MALICIOUS

PDF

73.0 KB Created: 2021-09-09 01:54:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ae1c59028b77b00e0f3a7d700b8ba07b SHA-1: 64e8ccc9be9d9490d5b3befd73c7f9d5ee1cd432 SHA-256: 77e5ff3f600a7d5be5b1ffb628e5395049c546a4abd4c621076d31b6a8b911d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to multiple compromised WordPress sites and disposable hosting domains. While no scripts were directly extracted, the PDF structure and its nature as a link farm suggest it is designed to redirect users to malicious content, potentially for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16138dbc09185c---vapoxaliliwofavodomaf.pdf In PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210908055045.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/5230323142.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612fafdf63470---25039957018.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/in7p2pbqfktm9ck7gh6qmc24t2/65879184955.pdfIn PDF document text
    • https://bellcera.60km.com/upload/files/borizafuxezivomukunon.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/gogerebe.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbcf3e5cda---pedemewovuzuvus.pdfIn PDF document text
    • https://aneri12.cz/res/file/lujireboki.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/wedotelop.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/60490918443.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/biguwepuguvuwimugakiw.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/76606425502.pdfIn PDF document text
    • https://pr-dienst.ch/file/bojazedividibetago.pdfIn PDF document text
    • http://runhouchem.com/upload/files/32407980807.pdfIn PDF document text
    • https://mimpishio2bet.net/contents/files/butedunikeni.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/11351208671.pdfIn PDF document text
    • https://pasarant0g3l-turbo-h1t.com/contents/files/15296115508.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/43263293727.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16135c0986629c---94747644801.pdfIn PDF document text
    • http://wksx.top/images/userfiles/file/89060314493.pdfIn PDF document text
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/befuzetiragawodex.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/87503940555.pdfIn PDF document text
    • http://www.startbatteries.gr/ckeditor/ckfinder/userfiles/files/2094818055.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/kofuwipadebufip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=can+t+receive+text+messages+from+iphone+to+androidPDF 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_off0000ba70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA70 16448 bytes
SHA-256: ff342cfa8760aabb0318d9ebbb126d12fbb4daf15b1fe4d68e2dc301b0d02cef
font_01_sfnt_off0000e445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE445 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5C 11220 bytes
SHA-256: 70193268ba07afb54fb24619a96d56127ef9236308f66945bdcfae869c248466

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