Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4537f6016d635e7…

MALICIOUS

PDF

71.6 KB Created: 2021-09-27 07:53:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7f4ffe9e13886a118b10bd044b027ff7 SHA-1: a7fbe7ba2891e4a70f75805dc6a16f0af026d685 SHA-256: f4537f6016d635e7443215e8e18aac396c9246517720600fb3a6136930b88f64
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to potentially compromised websites or IP addresses. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of embedded JavaScript suggests an attempt to execute malicious code within the user's browser or PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://istihdamhaberleri.com/upload/ckfinder/files/gurijurejajo.pdf In PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/88148368076.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/nipivarujowazosikamoguno.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/wulezakezuzugeloketivafed.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/41058bcefafffe47d489d3d3e5f79378/leledojuwudunu.pdfIn PDF document text
    • http://vladekoservis.ru/files/96571240607.pdfIn PDF document text
    • http://140.121.161.111/ckfinder/userfiles/files/18915210991.pdfPDF link annotation
    • http://faw-asia.com/image/upload/files/82192410398.pdfIn PDF document text
    • https://mirrorlink.com/public/files/files/22043517866.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/vivojekijimujakujar.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/82481176724.pdfIn PDF document text
    • https://creativekids.abcedukacji.pl/web/uploads/files/fisivusunoja.pdfIn PDF document text
    • http://miryangpension.com/FileData/ckfinder/files/20210916_41F8CBDED424F08A.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16138e1cbb3e82---46973622277.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/vopitorilevonigepizifu.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1614516c5415cb---284670945.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/lidigi.pdfIn PDF document text
    • http://glassick.com/userfiles/file/nifegimokapedonuginalumog.pdfIn PDF document text
    • https://stw-nowogard.pl/download/file/ziwap.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/megotipojibolu.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1614ce4ff1a295---14516632108.pdfIn PDF document text
    • https://thermaltrailrace.com/imagini_ws/10397597591.pdfIn PDF document text
    • https://limsurempat.com/contents/files/wawuwu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=descargar+juego+nba+jam+para+android+gratisPDF 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_off0000b224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB224 17520 bytes
SHA-256: c91ea4079558c15570d581687d0fc1f3dd70825b36b333e061f4be18ff6ee365
font_01_sfnt_off0000df38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f74f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74F 11180 bytes
SHA-256: 09937982f65c8e99c1838202dbc524eeee9824e285ea9748bc57a9aa75ec8b50

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