Malicious PDF — malware analysis report

Static analysis result for SHA-256 86bbf090fc66dd74…

MALICIOUS

PDF

85.5 KB Created: 2021-06-29 11:50:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f3cbe310882f1a54c775f3f3875e4a1b SHA-1: 63912e65aac4140c10a40fae371015a3768ccb84 SHA-256: 86bbf090fc66dd74e3a46bc2542d4cc7736fd324c5c6f4252b7becc13885cec7
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the PDF structure itself facilitates the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f838583430---rirawez.pdf
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/4f7d1b72f0680a55a0a9a7be885f7bca/53837525393.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160da6f9647f4d---28330949181.pdf
    • http://perles-del-beya.com/userfiles/file/gigekatufizovozimumo.pdf
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/84ba388631fc80d14e18c54c06305354/kuwigapokubejutif.pdf
    • http://esoftland.com/userfiles/file/17280815192.pdf
    • https://x-software.cz/data/file/61796898497.pdf
    • http://www.darvidproperty.com/news/file/tinotinuz.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cc4a1564bf3---6529136741.pdf
    • http://s8radziejowice-paszkow.pl/userfiles/file/fibusor.pdf
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/4fda60b2f4ad35e993f9f62609f4ca41/jemorupina.pdf
    • http://www.advokat.com/app/webroot/img/fck/file/1228180857.pdf
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/rbs4o803jhnror6livrkot3scp/guligutorubutuvojujisi.pdf
    • https://die-elke.de/cms/elke_page_files/file/lufewowabikusimexam.pdf
    • http://walkofagesvt.org/clients/0/0e/0e42319052772b195a43ba3ede0f03e0/File/karezupusaj.pdf
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4cfa58efa0---wifemolegoletabagopiwuv.pdf
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f4b96988e---30054474453.pdf
    • http://ebslang.net/_UploadFile/Images/file/30072163935.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c8965ea5cf7---ruxelijudu.pdf
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/42u5q6rb0072tiveqqnq6mp09u/rixafajusaki.pdf
    • http://sb-78.ru/files/file/81366869316.pdf
    • https://charterfori.ir/basefile/charterforiir/files/dosupanetusukejo.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16099ab11b39f0---vabepi.pdf
    • http://daearesort.com/FileData/ckfinder/files/20210621_21B89380F5DA1F39.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/9arup4v4hu4a78vub03ka204hn/64721659078.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=tag+question+ought+to
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee52.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE52 16792 bytes
font_01_sfnt_off00010669.bin
aa607b3e7e9ff0f88a3d60ef139468d9819f17bfb898b11d8b901caa2fb6594c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10669 10452 bytes
font_02_sfnt_off00011dc6.bin
1ce87f2e14cdc1fb3cda5a563ef09c25e1dd4ef00ecfaadb6e12f3a628dae845
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC6 16556 bytes