Malicious PDF — malware analysis report

Static analysis result for SHA-256 41456d314b9a757a…

MALICIOUS

PDF

86.2 KB Created: 2021-09-15 14:01:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 919dfe65027a14d41c20b39ab7b15e6a SHA-1: 9927f11a92ceef0d9c1f3e02ddcc021db83eb8e2 SHA-256: 41456d314b9a757a606e42a61b9543dff51a374d80dbbe4670ce93d0ded482b1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to potentially compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. While no scripts were explicitly extracted, the nature of the links and the overall structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://thuexedanang247.com/uploads/image/files/tupuvolirapelani.pdf In PDF document text
    • http://qapoll.com/2015/vat/upload/files/5106088004.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16138edc900f24---munuteforativukari.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/19391710203.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/76435344669.pdfIn PDF document text
    • http://denkobarbell.com/_upload/files/xifosaw.pdfIn PDF document text
    • http://tg-focus.ru/userfiles/files/sadowajujetusage.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/tidotowo.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/29764606882.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/nuzozulunolukaga.pdfIn PDF document text
    • https://girl0229960192.com/upload/users/files/tegululofexovibomu.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16134fb8a68a7a---dubalagovudapod.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/1842965c7ac732c97e9624f059ceb309/kobaselivok.pdfIn PDF document text
    • https://cyc-catering.pe/disac/userfiles/file/povuso.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/wojeriwogufaxozivajewifa.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/vugot.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/35758039932.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/54541335385.pdfIn PDF document text
    • https://linkevicius.com/upload/galery/file/17608173405.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/domoze.pdfIn PDF document text
    • https://alshuka.ps/ckfinder/userfiles/files/55758365496.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9698291e4---xifilajunulazo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+to+install+root+explorer+on+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_off0000eb73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB73 10564 bytes
SHA-256: 84e78c6d29afc3fced8af8251bc3e991084d65bef9f79a604388bba52df7d2dd
font_01_sfnt_off000103b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC2 18248 bytes
SHA-256: 01f837d751e3695fe50e46367927e82caaf2c34d8e7c25f70961f3abb91fa79b

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