Malicious PDF — malware analysis report

Static analysis result for SHA-256 956c66e38dae4609…

MALICIOUS

PDF

77.0 KB Created: 2021-08-27 15:10:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: efe8805d3df398cb59597a143d734c6f SHA-1: e9c8fc4d4de5de01e8ec398f261d998fd08c88dc SHA-256: 956c66e38dae4609dd2f54699fdfb60bdd0859068341b74f18bcdee161cf3f13
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with high-severity heuristics indicating the presence of random and compromised URLs. The numerous external links, many pointing to potentially malicious content on compromised or disposable domains, strongly suggest a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure itself is used to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://queure.ru/uplcv?utm_term=1.4913+stainless+steel+equivalent PDF link annotation
    • http://bobas24.pl/Upload/file/5813191014.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e00b88fb2---49015191136.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2f90b7285---nulujoger.pdfIn PDF document text
    • https://eubeer.vn/uploads/files/navoverabowofanozabevup.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/popow.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/36462390885.pdfIn PDF document text
    • http://xinchenfast.com/upload/file/laweguto.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/4b8b69a34140a83605888fb035730481/dokuti.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d954c29ee9f---10657492063.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a7866e81866---67696102646.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/100807079788.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/78689136737.pdfIn PDF document text
    • https://sanidom.pl/img/file/wuges.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160faff3ae275d---foxudolebozub.pdfIn PDF document text
    • https://ckd-otto.com/contents//files/buxuzi.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/2jf3g0iedcjj37046ekr31n16b/zopuwogazosakutatajef.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/zejajukit.pdfIn PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/jedenux.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///bunosadudegogatenanet.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608f64b6b1132---25781677882.pdfIn PDF document text
    • https://childrencareandliteracysociety.org/userfiles/files/45002297138.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/79544692234.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_off0000c67b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC67B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE92 10632 bytes
SHA-256: 4bceca670906b05962a9bc97c99bf3e1d7c49284536316ee45f236abd4b3a166
font_02_sfnt_off0000f712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF712 17528 bytes
SHA-256: 30a96546e52aa0ca8556dd1f734ef8ddf672657a4363560acc33fdbd781bf395

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