Malicious PDF — malware analysis report

Static analysis result for SHA-256 56dc29c9978c9cc2…

MALICIOUS

PDF

84.2 KB Created: 2021-07-17 21:34:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: abe967f6bc20fa50bc7df26db1e9f328 SHA-1: 708d796f89bacc2f2ca43c8b804d2b3ac45aaa09 SHA-256: 56dc29c9978c9cc28ebb7dda42c4baf79ac7ef9c805e133e8f40b3a0a5a3ff82
212 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF contains embedded JavaScript and numerous links to compromised WordPress sites, indicating an attempt to deliver a malicious payload. The presence of a 'download button' lure further supports a phishing or social engineering attack. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for distributing malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 9

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://195exim.com/datas/files/16783568405.pdf In PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/stvvcjfch2ndj48g4an7aqqad3/zeriwokegalujo.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/08b8b921fbf1acf334cfee63fbb07490/52444121231.pdfIn PDF document text
    • https://anukulagrotech.com/ci/userfiles/files/44833009715.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609866c62062e---60081881407.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/51149166180.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/12923d2a99877976e27cc813b1db006a/babiporoduwonegoleguwa.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bf49eebe7e4---wetapuwi.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/35174366351.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/qk65pqleabl3b31d2j0joo1f5q/xibijijofirudev.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202107/file/32970318174.pdfIn PDF document text
    • http://moreit.ch/productinfo/file/26750050942.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/a8e43e402df4a4163fec03a2e7ccd112/nobagevovenenularivamogaf.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/pcb5rqfmvbmskmhmvj9ni4oh7j/62649435434.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160afca547db5e---31349836036.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/gitexot.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/tf1i1kf2aprllgn4lndjsp075k/wogiwevo.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/d174336e3b3add9a52450741628bcefd/welazowudoroxoxomudetefe.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/31871945054.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc3341cc5df---17048655531.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160832603cf43c---jifen.pdfIn PDF document text
    • https://mytopics.it/uploads/file/zagagedipupos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=ts+grewal+double+entry+bookkeeping+class+11+solutionsPDF 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_off0000e420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE420 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC37 11236 bytes
SHA-256: 845d86d97d2c6719bbcb3e7424a60dbaeea5cb68f8d2c91690b49cb41ab80230
font_02_sfnt_off00011664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11664 17208 bytes
SHA-256: 72dd37a463af5975767f38a604194ef91564f85190a038caa26fb282b5f0c4f2

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