Malicious PDF — malware analysis report

Static analysis result for SHA-256 75486d91fbd140f9…

MALICIOUS

PDF

83.5 KB Created: 2021-08-23 11:22:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 666d0b9fae020fffbbfc2224e9c75c89 SHA-1: c7379920932a642e1cc0b2ab81c4db811bfd2a4d SHA-256: 75486d91fbd140f9857438f4f76749971ba443fec92c8a7561af4efb4376295d
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs that point to external resources, some of which are hosted on compromised WordPress sites. This suggests a phishing or malware distribution scheme, where users are lured to malicious sites by clicking on links within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://himalayanwanderer.com/himalayan/userfiles/files/kovizuvig.pdf In PDF document text
    • http://carszana.com/image/upload/File/99746949421.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607aeca45df84---64117518463.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/gimilumuzivapemepiz.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/tirexinuted.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/86285197171.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/ba3cfeecb4496f518ba43d7a96a10a33/pukadi.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1c6ed094b---59498260562.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/abc3de5bc69e1cb900a9cd1c21139265/10572929811.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/92989071937.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/zovodipalobujotoxafak.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210607080306005221cjg4ze.pdfIn PDF document text
    • http://mehmetrasimmutlu.com/icerik/file/62205484104.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/dalaxexikaliw.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/48846174462.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/takejizetowebupegajojal.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/3pg7kc28dgkorjn5o0k9otiknb/80138788895.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/2466840610.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/103d3dae0f011ae7911bdeca65d3db92/89817148937.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/361e8165971b3a5dc90c6dc0eb13d60c/tarosemupemulaxemedo.pdfIn PDF document text
    • https://408of53crownstreet.com/assets/media/files/wawuladosepubevig.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/kolejaxokisunufegexogiso.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c94fcced707633011975faf4b1fc6a75/bilalezomosumuxakufeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=inflation+of+goodsPDF 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_off0000e351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE351 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB63 17464 bytes
SHA-256: 61b1e24b2f90bab2681c28cc34538a2b5e0c25b0af1d28f5941303aaefadd2e6
font_02_sfnt_off00012922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12922 10248 bytes
SHA-256: dad47229b853e538df16533020dcd1294ad340ea580c3454bb56f8b029143e39

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