Malicious PDF — malware analysis report

Static analysis result for SHA-256 02df44f60b735265…

MALICIOUS

PDF

100.0 KB Created: 2021-07-02 22:46:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e3f74a07598121f96ef454b5ba3c424b SHA-1: 43b13abd5c4a86350e0ffb42c6f19efa33a7393b SHA-256: 02df44f60b73526518f5c37cbb1368ca1df4a14ac8f5c163583978155c5018cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories on various domains. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a link farm on disposable hosting and compromised WordPress sites suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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 https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/64cd04fb9aedb9b73e823f72025beed0/mokavabomejudekigidigawi.pdf In PDF document text
    • http://charivne.info/images/file/luridutokuzemif.pdfIn PDF document text
    • https://saam.vn/images/content/file/bewok.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16090c5f58fefe---pazejupixatigupub.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210617134617_zxolrp.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/tirorevon.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608307f52677f---12464474139.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/xidepanopatutivefin.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/guxiz.pdfIn PDF document text
    • http://oilandgaswork.com/userfiles/file/vonotapefetidoxatisej.pdfIn PDF document text
    • http://garystrike.com/clients/3/30/301ae0ed988f9237e4cb8f8c41f6cb36/File/tagugorakululimexuzov.pdfIn PDF document text
    • http://korytnica.net/data/files/50908490136.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/9285dc13211c0649c93130320af178f1/3597620354.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/2373064762.pdfIn PDF document text
    • http://chromoink.com/updates/file/42762539158.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/0a7d5e8728562a19a4b41db06a042d22/vipirasizadilumuzem.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/796be1a33dbd00e3c2a41a3b3dfe181e/fuziwafo.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/04de8361ecedddd33170d2963972ffef/wekezi.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/kjrfc79fronbb0ucfpag9hvjl5/larifugu.pdfIn PDF document text
    • http://controlsystemco.com/cache/fck_files/file/senukigul.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160ca822f59ba5---99320858044.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160803cf2a842a---15869052188.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/f60fb5cf2de894a965443e8940d4090d/36578834722.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/limokip.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/vurizofudilenej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=list+of+german+dialectsPDF 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_off000123e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E1 10776 bytes
SHA-256: b29cae62e3231b9c53f725a1f84f408ea748644df2d64099acc86a68e9f61923
font_01_sfnt_off00013c76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C76 18288 bytes
SHA-256: bb0e6bfb01004688500fcdbb24df21dc5ac2c85594118f7f65ddaca211d1726e
font_02_sfnt_off00016ab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1