Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ef8b930ec0c24db…

MALICIOUS

PDF

84.1 KB Created: 2021-09-18 14:48:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f0e5c8fe9a794083018de9c3794094cb SHA-1: 1b5cacb220d0a0ce2d3530eb4424c839c288ce3a SHA-256: 1ef8b930ec0c24dba56fbac701babb04e2d0c2c7432be17166321755df6f58cc
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that lead to compromised websites and link farms, suggesting a phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports the conclusion that this PDF is part of a campaign to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://oniceh.ru/uplcv?utm_term=view+my+laptop+camera+remotely+android PDF link annotation
    • http://4grd.com/cmsimages/file/68275162105.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/vorokadilumifo.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/73527545019.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/53442674333.pdfIn PDF document text
    • https://hotelgaric.com/upload/datoteke/75508331718.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa57e368ac---lonubizado.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed2712cd3d---23770959379.pdfIn PDF document text
    • https://mimpiindah168.com/contents/files/busitidog.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/buwupamasarugedofatav.pdfIn PDF document text
    • http://gattoneva.pl/pages/userfiles/file/sapap.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/rikiwobowexofupevawaj.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/kejebexanukirib.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/mebuxiposadoziku.pdfIn PDF document text
    • https://butyfarm.mm520.net/userfiles/files/69430501683.pdfIn PDF document text
    • http://virtuozi.ru/sites/all/sites/virtuozi.ru/files/64943134370.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/fanakajesixibevojozep.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/jutiwuz.pdfIn PDF document text
    • http://appextskihjthj.handysociality.com/upload/files/79858995218.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/94962918519.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/vilikizaxeku.pdfIn PDF document text
    • http://arsvet.ru/img/upload/jezixuxulavanixivizabar.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613100ae7ab3e---28042698188.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/pakafitujaxiwukexebuxeju.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/62302305459.pdfIn PDF document text
    • 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_off0000e3df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF6 10676 bytes
SHA-256: 0502dc828ff007a350dbbd00eb588a67acbcad6dccc79abd842a4825696ae129
font_02_sfnt_off00011471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11471 17700 bytes
SHA-256: 080369ff7f58f2613d75a1f516d7b0127620448ac679d858b1992fa4d90b507e

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