Malicious PDF — malware analysis report

Static analysis result for SHA-256 a330b19896421e71…

MALICIOUS

PDF

83.7 KB Created: 2021-07-04 10:52:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fcb6c2fdfcee4072ebf329aec3506014 SHA-1: 3f940db1446649bad11ba5bb259e0df359d62259 SHA-256: a330b19896421e7157ed98607b0c3d78ff356b65375520162617573b046c9056
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating it is designed to redirect users to potentially malicious websites. ClamAV and ML classifiers strongly indicate malicious intent, classifying it as Pdf.Phishing.Trojan. The presence of multiple compromised CMS upload links further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/uplcv?utm_term=stretches+for+upper+back+pain+in+between+shoulder+blades
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/0104ae94888abcfe3fa99f82b3cece43/webife.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6ca358428233919841a3800ab26af3a0/98696909216.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa74abe00a---danugogumu.pdf
    • http://holycrossyouthministryasp.org/clients/f/fa/fa15eac34f6f8ef5a8ada011ffef1578/File/gupaziz.pdf
    • http://bestbuyfromindia.com/userfiles/file/69205259106.pdf
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607f451281833---38450110561.pdf
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/53eb29b765bea77f53c105446a67d7bb/zebuvijixutasakexuvi.pdf
    • http://networkinglikepro.com/ckfinder/userfiles/files/tibasuxa.pdf
    • http://ibb-online.ru/f/file/29254414064.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160861729ea844---351494168.pdf
    • https://feniks9.ru/ckfinder/userfiles/files/vebusadujefam.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/mh7ueocfr5jie2hra7nqp3ajdn/pidokisimiguzufigobivig.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc74bb20f8---jujefipid.pdf
    • https://speakingparrot.com/upload/ckfinder/files/35527315712.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc2e05bad1---nojeluge.pdf
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/pivoxafadinededexolorori.pdf
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/7edc2019ea5cc3430546e36592907ac5/juxataxovo.pdf
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/d9e1ba33ed9dedeae94d608f51123736/jenafusot.pdf
    • http://weberstellen.ch/userfiles/file/pimox.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/7744a565abcca2441a3f981943e3c034/58344907075.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160c6009577d50---lejupekid.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/5dbec73dea6a6b4817fed97568d5524f/jekomigomagox.pdf
    • https://linhquan-group.com/upload/ck/files/22439326381.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e665.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE665 16792 bytes
font_01_sfnt_off0000fe77.bin
288351735c8dd4907739fbc57f966e1c34d72c3603d601963ee99db30144585c
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE77 15824 bytes
font_02_sfnt_off0001272b.bin
b8048f660d60678bdb740367dfe3c817ebb459cd781ddd381674b85a838c1dd4
pdf-font-stream PDF embedded font (sfnt) at offset 0x1272B 11208 bytes