Malicious PDF — malware analysis report

Static analysis result for SHA-256 c01ea1e799c525dd…

MALICIOUS

PDF

86.4 KB Created: 2021-07-18 07:35:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: b3706df67c9d233217a284c56b7bd789 SHA-1: 4ac0a1b5117113e320bfc7d82645e3a417aa7fa9 SHA-256: c01ea1e799c525dd3e4fb581d45411c84eced32bc0440a3651fe91ef8a205c2e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

The PDF contains a high number of links, many pointing to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports a lure-based attack. ClamAV detection and ML classification confirm the malicious nature of the file, likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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.
  • 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 https://keluargamimpi2.com/contents//files/luvogufasafodawomete.pdf In PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/59ce050f499d05d0359b958a880cccdf/xowavo.pdfIn PDF document text
    • http://etre-belle.su/images/file/jujepojotuze.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/59830581278.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/derat.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c87867d0c57---nopum.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/abe8lkea6cnttorbmg1k33mboe/29956254716.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/90481960823.pdfIn PDF document text
    • http://digifast.cz/userfiles/muxenobavud.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/a5285e9265323dc2c66339fc23b45e82/fagoreluwopudopokozogebuf.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/38715013424.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/3c49f8b0f2a3301544b46f13a36fcfa9/monin.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/fipakelexamilijazevixakol.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/4968320731.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/4b742c5c460bee625266d81200ee9dde/49268217804.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607450fcb6d9a---57508849785.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c674452d6a3---50004311511.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/70298999962.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b313e9bf737---89300647173.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/eaec754dc63291f37023491e824037ec/kajitex.pdfIn PDF document text
    • http://atomleasing.ru/media/File/jaxumejonuzexovizawumusi.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/287947af1dc74581fd026531275f973c/91766770764.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/62314448420.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d4a91dacbc2---xogarokotagubipaguxagut.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc87a0691a---15544515640.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/8f1f969d4f1e66b962c700f215ba46b4/xukevumunov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=painting+with+light+pdfPDF 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_off0000f082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF082 10344 bytes
SHA-256: aa2a413728b80d862b10936700744b54784e52fd003b2f5b4246fc4aedefbae3
font_01_sfnt_off00010787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10787 17172 bytes
SHA-256: fe217f9977774bb0e51b42707272fe75ccc52a138b20f0c91e7b857c160483ce
font_02_sfnt_off0001343d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1343D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1