Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c548ed0e7404a20…

MALICIOUS

PDF

110.3 KB Created: 2021-07-05 13:46:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: deecf2a06068a8480d2e4fda05946bf1 SHA-1: 1805be5cfdb5427f7d745ee26945f6a4a3d8a1f0 SHA-256: 6c548ed0e7404a20a3e602ea6ca80a0af8eba20934fad81e2573feaae500580e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, which are likely used to host malicious content or facilitate phishing attacks. The presence of multiple links to compromised CMS upload storage indicates a deliberate attempt to distribute harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

Heuristics 6

  • 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.
  • 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://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160d6dcf5767c7---3520061573.pdf In PDF document text
    • https://corpusbg.com/files/fck/file/1546277233.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c96b200c2b---17716791356.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16094676e09c2b---gozuleramagasexij.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16096e22086af6---76076316880.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7f570a165---talidajopomudo.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/444bf94daceed6fd84f2247521755ed5/mowosopax.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/tomosarasa.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/wusepab.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160862d1bc25d8---82961203076.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/91787057876.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/nmvf560jb8rahloro70e2lsaod/pafobevetagobibalogomidos.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/8e857ff3515dafa2116ec7f35666c03a/tiluxakeb.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/61a4a3a7d7019eb23a96df716b0d1615/wodomojidalexo.pdfIn PDF document text
    • http://usateatop.com/_upload/files/20674933278.pdfIn PDF document text
    • http://446888.top/userfiles/file/36632801857.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/0c97a25e928d11b323065b1be260baa8/kejuru.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160824c1d0b35e---kefejotonulilu.pdfIn PDF document text
    • http://beloit1962.com/clients/8/83/8368a4f838dea3176655029ae9e337da/File/jurimegenokunulirenizofos.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/16082e793abccb---pekejojago.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/45573227.pdfIn PDF document text
    • http://euro-ex.net/images/blog//file/gadukozavepote.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=ares+in+roman+mythologyPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001286f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1286F 18524 bytes
SHA-256: b3437d3891864a890eea513161e2d4daafa89e7f600bc148e68028133823851b
font_01_sfnt_off00014652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14652 21056 bytes
SHA-256: 625f95eab1b9e52257e0378aa956c0b270381b5e8e844de1c91eab3e6a8b5f5c
font_02_sfnt_off00017b4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B4A 10652 bytes
SHA-256: 15f903dd7ad881f604c46b465366c4cddf77699f380d316f92aaeb69adfc843a
font_03_sfnt_off00019387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19387 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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