Malicious PDF — malware analysis report

Static analysis result for SHA-256 e732f02877749599…

MALICIOUS

PDF

103.9 KB Created: 2021-07-19 23:37:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: de22ab503845abf8e23f08c723e5b518 SHA-1: d213284d05f09cf2b479f3f094e1c2607901cc84 SHA-256: e732f02877749599a0efc3ace5ed4716e2534a3a21e96f0ea5fa1ddef60e0c76
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users to malicious sites. The heuristics indicate that the PDF acts as a link farm, pointing to multiple compromised WordPress upload directories and disposable hosting sites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9747

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.
  • 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 https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/4bup5hv7keknh2btv7clsas90e/51965512325.pdf In PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608009fd0082f---bozafefonogeb.pdfIn PDF document text
    • http://gptools.net/userfiles/file/68076997171.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/02oaf7s2codc8e0j763fhu0jug/vobatetajuxelilaxanawenam.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/63843256771.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/4qdhsqfir3edijmtmbfbgben20/36099871303.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e7cc2785d---67085075024.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/babemexigilonikem.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160baceb28d6be---79745748858.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5dd7396fb2---padawidujabakuzojusejonij.pdfIn PDF document text
    • https://birotex.rs/images/files/fiserugumofolepitatuvi.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/5644922624.pdfIn PDF document text
    • http://integrotech.com/zdjecia/file/nudob.pdfIn PDF document text
    • http://poiskvod.ru/images/file/fifobagarenu.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9df95f086---rekibojusuku.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3c9ac89f1---wozawa.pdfIn PDF document text
    • http://gojjang.com/uploads/files/mogosefubifexow.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/wigazemubax.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c5ff278f7---vakisomidupuluta.pdfIn PDF document text
    • https://bushregenerators.net/userfiles/files/81118041777.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7bjdl8bdofhg7h0rmcgul02nm1/pixitanoropowipanexaxuxow.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/897fc64f9ca5be74632e80a681be2d8e/23890531155.pdfIn PDF document text
    • http://flexa.cz/docs/file/ginefemezamoj.pdfIn PDF document text
    • http://sl1971.com/clients/5/51/517263f0417f9379c67e6eba0e0bdfe8/File/vasewakoxitud.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/reluwaguposegexetatidukip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=muscular+meaning+in+englishPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000f325.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF325 19572 bytes
SHA-256: 3cf2bf584f06567ed4cfcf408ae98494742b6c4b06a70751bf4a97992226a7c2
font_01_sfnt_off00011497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11497 10552 bytes
SHA-256: 4fd5949d596e62db603cff8f034605597127711e3526bc7e1cc9a21fe246b1ac
font_02_sfnt_off00012c5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C5C 3464 bytes
SHA-256: a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff
font_03_sfnt_off000139d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139D7 26744 bytes
SHA-256: b2a9a5a04d7bdf73de6dddb55c20a24dc1faf4c2f4b0c23131b260ad7d16609e
font_04_sfnt_off00017907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17907 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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