Malicious PDF — malware analysis report

Static analysis result for SHA-256 b95edf5e802eb577…

MALICIOUS

PDF

90.6 KB Created: 2021-08-09 19:08:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5710da28415e1ea2c6f0aff8a66df476 SHA-1: 31cbe545d5d12a28926eb857f0ae1ce572ea3522 SHA-256: b95edf5e802eb5777583986ca7134bf75c54dbbe061c26eb754ab70b926c3277
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The 'SE_INVOICE_LURE' heuristic indicates the document's content is intended to deceive the user into taking action. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/c8c23f5fb6d7e917c2afe474c38fbd3c/majafanopakunitikinim.pdf In PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/954cd64967aee77881016b919104b1a4/fezejebedefixekuvi.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/3847b5668af4db1ad3880d4ae61b7cd7/26190481292.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/373677863b046cabe9a41a9fe7b552c6/82244076313.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/gnl6ppqd7usa26n7vfr98d3jr0/38600949495.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ffb886615---zojiwogasigigig.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/7qeoi1tl9kbffethol7858jf5l/gatewewurozelisiwexej.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/26562141871.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/86tobe79jokqg13ija0aa383cv/jupokuduxobazinojudosa.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/xajevuberufotiraxabok.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f94623d9777---zufifewiwefos.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/gixedefolajasodus.pdfIn PDF document text
    • https://summit-christian-academy.org/scauserfiles/files/59181084246.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa04589804c---vinopuzaxorigega.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/ranokode.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/2eff0cfd0562aa877ed6151c1b6626c7/67025826175.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ffffa516f---sorosojoxebimutedarigale.pdfIn PDF document text
    • http://faradbox.pl/files/file/sebirunoluzexafizese.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b6982561bb8e7bcbd6be81f841e361b2/39808283514.pdfIn PDF document text
    • http://iphysiology.ru/upload/wobibexozakawaja.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/f8068483c780e644f99899f2214da3c9/10533700957.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/73766032243.pdfIn PDF document text
    • http://artside.org/data/temp/file/26981557535.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/kasizudepelogelipejemexif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+to+run+python+program+through+terminalPDF 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_off0000f9d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000111ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111ED 10824 bytes
SHA-256: c691180e7066ac85c0fbf3a8f65d207e4d18aeacd8432c4320484f684e277088
font_02_sfnt_off00012ab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB3 18372 bytes
SHA-256: 25de8c504a250ae4eb90af5881fdc8997591310d51dde687e2d68ef3cd637acd