Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3d75b42a44a3e17…

MALICIOUS

PDF

80.4 KB Created: 2021-09-15 09:45:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fffacc94f8c3a40c11aca24155e348c7 SHA-1: 2dcb91b7e4a17d79654619a769e76f27d6c86433 SHA-256: d3d75b42a44a3e1761a8b8cdd06f622cebac26570774d229ec3e3a611ab842bb
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. The document contains numerous links to external URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting an attempt to distribute further malicious content or conduct phishing. The presence of embedded URLs and the nature of the linked domains indicate a likely attack pattern involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://crysiq.ru/uplcv?utm_term=the+room+three+apk PDF link annotation
    • http://mvdeastudio.it/userfiles/files/lalezisatasuzepew.pdfIn PDF document text
    • https://seerupit.dk/assens/file/82973284882.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/pnoapgjq6rgch78h78g4r19o86/vudetevoguped.pdfIn PDF document text
    • https://mokshadhamnepal.org/userfiles/files/jimazawefo.pdfIn PDF document text
    • https://chasehr.in/userfiles/file/kofed.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/rojaro.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/d77ae5f483e764bd3b96e5d0ccbab265/rebawuvekulozizak.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/43067842965.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/darivufigubakutodaviwozi.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/jofas.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/jowinisikenuvigub.pdfIn PDF document text
    • http://theponghop.com/upload/files/moserupopowibot.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161325d05aeb71---waxukelepojimifikufu.pdfIn PDF document text
    • http://old.smartplus.pl/ckfinder/userfiles/files/xurorusub.pdfIn PDF document text
    • http://expertworker.paraleumarian.ro/app/webroot/files/userfiles/files/bipazisib.pdfIn PDF document text
    • http://hzbmsj.com/images/upload/File/nosuba.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/dujedebolelabibejo.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/dugijosogotuxudojutij.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/ritil.pdfIn PDF document text
    • http://ambulatorioveterinariocigliano.com/userfiles/files/katokazawid.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/81e7f202fc80e1480ce2760e31a4363c/ragami.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_off0000d848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD848 17520 bytes
SHA-256: 7a280c7d6f2108cfcc71af834fd7b9d806b73866edc0f12eb4cf701574887e63
font_01_sfnt_off00010540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10540 10164 bytes
SHA-256: 830b86cdca922569241176c297c61c3d1f28d6a03a11364b2c17b9bd597fca29
font_02_sfnt_off00011c0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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